Added and commented out the CFLAG -DENABLE_DRD_CONSISTENCY_CHECKS.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11323 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/Makefile.am b/drd/Makefile.am
index f28c752..edfd7de 100644
--- a/drd/Makefile.am
+++ b/drd/Makefile.am
@@ -41,6 +41,8 @@
   -Wno-inline				\
   -Wno-unused-parameter
 
+#DRD_CFLAGS += -DENABLE_DRD_CONSISTENCY_CHECKS
+
 #----------------------------------------------------------------------------
 # drd-<platform>
 #----------------------------------------------------------------------------