Gcc: Upstream Patch

The accepted upstream patch is mildly different to the one we currently ship for Yosemite, most notably because the upstream patch doesn’t touch libsanitizer.
Thanks, I didn't know there was a quick route to the commit hash. I tend to keep them in a special subfolder so if I change them I know to check the corresponding Homebrew formulas as well. Have changed in the latest commit :+1: