improved the build system


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@9 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/acconfig.h b/acconfig.h
index 068c694..78bd792 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -3,3 +3,6 @@
 
 #undef GLIBC_2_1
 #undef GLIBC_2_2
+
+#undef XFREE_3
+#undef XFREE_4