Update gcc in tools/REVISIONS
Update gcc in tools/REVISIONS

This brings in:

a767266 Make -Os a fatal error

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2535
TEST= none

R=bradchen@google.com

Review URL: http://codereview.chromium.org/9107016

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@7566 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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