Moved the basic syscall stuff out of m_libcbase.c into a new module
m_syscall.c.  Plus some associated cleanups.

Moved VG_(sigreturn) into m_signals.c and made it local.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3922 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_libcassert.c b/coregrind/m_libcassert.c
index dea4f05..d5825bd 100644
--- a/coregrind/m_libcassert.c
+++ b/coregrind/m_libcassert.c
@@ -35,6 +35,7 @@
 #include "pub_core_libcproc.h"
 #include "pub_core_main.h"
 #include "pub_core_stacktrace.h"
+#include "pub_core_syscall.h"
 #include "pub_core_tooliface.h"
 #include "vki_unistd.h"