Move default PTRACE_ constants into new file trace-defs.h
Include it also in events.c, where we use them as well.
diff --git a/sysdeps/linux-gnu/trace-defs.h b/sysdeps/linux-gnu/trace-defs.h
new file mode 100644
index 0000000..aa69b83
--- /dev/null
+++ b/sysdeps/linux-gnu/trace-defs.h
@@ -0,0 +1,92 @@
+/*
+ * 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
+ */
+#ifndef _TRACE_DEFS_H_
+#define _TRACE_DEFS_H_
+#include <sys/ptrace.h>
+
+/* If the system headers did not provide the constants, hard-code the
+ * normal values. */
+#ifndef PTRACE_OLDSETOPTIONS
+# define PTRACE_OLDSETOPTIONS 21
+#endif
+
+#ifndef PTRACE_SETOPTIONS
+# define PTRACE_SETOPTIONS 0x4200
+#endif
+
+#ifndef PTRACE_GETEVENTMSG
+# define PTRACE_GETEVENTMSG 0x4201
+#endif
+
+/* Options set using PTRACE_SETOPTIONS. */
+#ifndef PTRACE_O_TRACESYSGOOD
+# define PTRACE_O_TRACESYSGOOD 0x00000001
+#endif
+
+#ifndef PTRACE_O_TRACEFORK
+# define PTRACE_O_TRACEFORK 0x00000002
+#endif
+
+#ifndef PTRACE_O_TRACEVFORK
+# define PTRACE_O_TRACEVFORK 0x00000004
+#endif
+
+#ifndef PTRACE_O_TRACECLONE
+# define PTRACE_O_TRACECLONE 0x00000008
+#endif
+
+#ifndef PTRACE_O_TRACEEXEC
+# define PTRACE_O_TRACEEXEC 0x00000010
+#endif
+
+#ifndef PTRACE_O_TRACEVFORKDONE
+# define PTRACE_O_TRACEVFORKDONE 0x00000020
+#endif
+
+#ifndef PTRACE_O_TRACEEXIT
+# define PTRACE_O_TRACEEXIT 0x00000040
+#endif
+
+/* Wait extended result codes for the above trace options. */
+#ifndef PTRACE_EVENT_FORK
+# define PTRACE_EVENT_FORK 1
+#endif
+
+#ifndef PTRACE_EVENT_VFORK
+# define PTRACE_EVENT_VFORK 2
+#endif
+
+#ifndef PTRACE_EVENT_CLONE
+# define PTRACE_EVENT_CLONE 3
+#endif
+
+#ifndef PTRACE_EVENT_EXEC
+# define PTRACE_EVENT_EXEC 4
+#endif
+
+#ifndef PTRACE_EVENT_VFORK_DONE
+# define PTRACE_EVENT_VFORK_DONE 5
+#endif
+
+#ifndef PTRACE_EVENT_EXIT
+# define PTRACE_EVENT_EXIT 6
+#endif
+
+#endif /* _TRACE_DEFS_H_ */