Update copyright information and license headers
diff --git a/sysdeps/linux-gnu/x86/Makefile.am b/sysdeps/linux-gnu/x86/Makefile.am
index d5eb6e7..ee45bab 100644
--- a/sysdeps/linux-gnu/x86/Makefile.am
+++ b/sysdeps/linux-gnu/x86/Makefile.am
@@ -1,3 +1,21 @@
+# This file is part of ltrace.
+# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
noinst_LTLIBRARIES = \
../libcpu.la
diff --git a/sysdeps/linux-gnu/x86/plt.c b/sysdeps/linux-gnu/x86/plt.c
index bb1b2b1..dc6f183 100644
--- a/sysdeps/linux-gnu/x86/plt.c
+++ b/sysdeps/linux-gnu/x86/plt.c
@@ -1,3 +1,23 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2004,2008,2009 Juan Cespedes
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
#include <gelf.h>
#include "proc.h"
#include "common.h"
diff --git a/sysdeps/linux-gnu/x86/ptrace.h b/sysdeps/linux-gnu/x86/ptrace.h
index e0f5261..dc4734a 100644
--- a/sysdeps/linux-gnu/x86/ptrace.h
+++ b/sysdeps/linux-gnu/x86/ptrace.h
@@ -1,2 +1,21 @@
+/*
+ * This file is part of ltrace.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
#include <sys/ptrace.h>
#include <sys/user.h>
diff --git a/sysdeps/linux-gnu/x86/signalent.h b/sysdeps/linux-gnu/x86/signalent.h
index d58a36c..9b8baa0 100644
--- a/sysdeps/linux-gnu/x86/signalent.h
+++ b/sysdeps/linux-gnu/x86/signalent.h
@@ -1,3 +1,23 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2006 Ian Wienand
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
"SIG_0", /* 0 */
"SIGHUP", /* 1 */
"SIGINT", /* 2 */
diff --git a/sysdeps/linux-gnu/x86/signalent1.h b/sysdeps/linux-gnu/x86/signalent1.h
index 5395f82..31699db 100644
--- a/sysdeps/linux-gnu/x86/signalent1.h
+++ b/sysdeps/linux-gnu/x86/signalent1.h
@@ -1,3 +1,23 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2006 Ian Wienand
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
"SIG_0", /* 0 */
"SIGHUP", /* 1 */
"SIGINT", /* 2 */
diff --git a/sysdeps/linux-gnu/x86/syscallent.h b/sysdeps/linux-gnu/x86/syscallent.h
index 7d746b7..345fe20 100644
--- a/sysdeps/linux-gnu/x86/syscallent.h
+++ b/sysdeps/linux-gnu/x86/syscallent.h
@@ -1,3 +1,23 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
/* This file is for i386 system call names. */
"restart_syscall", /* 0 */
"exit", /* 1 */
diff --git a/sysdeps/linux-gnu/x86/syscallent1.h b/sysdeps/linux-gnu/x86/syscallent1.h
index c2d9017..91ae8d6 100644
--- a/sysdeps/linux-gnu/x86/syscallent1.h
+++ b/sysdeps/linux-gnu/x86/syscallent1.h
@@ -1,3 +1,23 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
/* This file is for x86_64 system call names. */
"read", /* 0 */
"write", /* 1 */