Avoid "undefined reference to `memset'" error when building with
USE=custom-cflags and -O3 in CFLAGS with gcc-4.8.

See:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888
http://bugs.winehq.org/show_bug.cgi?id=33521
https://bugs.gentoo.org/show_bug.cgi?id=480508

diff --git a/configure.ac b/configure.ac
index d8033cf..fe7cc7d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1767,6 +1767,7 @@ then
 
   dnl Check for some compiler flags
   WINE_TRY_CFLAGS([-fno-builtin],[AC_SUBST(BUILTINFLAG,"-fno-builtin")])
+  WINE_TRY_CFLAGS([-fno-tree-loop-distribute-patterns])
   WINE_TRY_CFLAGS([-fno-strict-aliasing])
   dnl clang needs to be told to fail on unknown options
   saved_CFLAGS=$CFLAGS