Remove -fno-common compiler flag for OS X.

[Mike Hommey]

From: Mike Hommey <mh at glandium.org>

It doesn't allow the je_malloc_message and je_malloc_conf symbols to be
overridden when linking statically.
---
 configure.ac |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 3b32b88..ed7d55b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -239,7 +239,7 @@ dnl to make happen otherwise.
 default_munmap="1"
 case "${host}" in
   *-*-darwin*)
-	CFLAGS="$CFLAGS -fno-common"
+	CFLAGS="$CFLAGS"
 	abi="macho"
 	AC_DEFINE([JEMALLOC_PURGE_MADVISE_FREE], [ ])
 	RPATH=""
-- 
1.7.10