Silence a warning for the statement "flags = flags" in  src/third_party/dlmalloc/malloc.c included by src/untrusted/nacl/malloc.c
Silence a warning for the statement "flags = flags" in 
src/third_party/dlmalloc/malloc.c included by
src/untrusted/nacl/malloc.c

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2279
Review URL: http://codereview.chromium.org/8021003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6771 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client