Rename the first three modules as per naming scheme.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3555 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/Makefile.am b/coregrind/Makefile.am
index 596d284..0f3a3df 100644
--- a/coregrind/Makefile.am
+++ b/coregrind/Makefile.am
@@ -52,9 +52,9 @@
 valgrind_LDADD=
 
 stage2_SOURCES = \
-	errormgr.c \
-	execontext.c \
-	stacktrace.c \
+	m_errormgr.c \
+	m_execontext.c \
+	m_stacktrace.c \
 	ume.c \
 	\
 	vg_scheduler.c \