toolchain_build: Update gcc revision to 4.8.2 release
toolchain_build: Update gcc revision to 4.8.2 release

This brings in the upstream 4.8.2 release.

BUG= none
TEST= toolchain trybots
R=bradnelson@google.com, sehr@chromium.org

Review URL: https://codereview.chromium.org/33243003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12294 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client