fix make distcheck with newer automake


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1443 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/memcheck/Makefile.am b/memcheck/Makefile.am
index 67c5b91..9fbf694 100644
--- a/memcheck/Makefile.am
+++ b/memcheck/Makefile.am
@@ -3,10 +3,11 @@
 
 INCLUDES = -I$(top_srcdir)/include
 
-CFLAGS = $(WERROR) -DVG_LIBDIR="\"$(libdir)"\" \
+AM_CFLAGS = $(WERROR) -DVG_LIBDIR="\"$(libdir)"\" \
 		-Winline -Wall -Wshadow -O -fomit-frame-pointer \
-		@PREFERRED_STACK_BOUNDARY@ -g \
-		$(INCLUDES)
+		@PREFERRED_STACK_BOUNDARY@ -g
+
+AM_CCASFLAGS = $(INCLUDES)
 
 valdir = $(libdir)/valgrind