Avoid compile warnings for tinycc.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5801 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/perf/Makefile.am b/perf/Makefile.am
index 83e9bfd..24f0769 100644
--- a/perf/Makefile.am
+++ b/perf/Makefile.am
@@ -26,3 +26,5 @@
 fbench_CFLAGS   = $(AM_FLAG_M3264_PRI) -g -O2
 fbench_LDADD	= 
 ffbench_LDADD	= -lm
+
+tinycc_CFLAGS	= $(AM_CFLAGS) -Wno-shadow