Annotate SK_COMPILE_ASSERT's typedef as permissibly unused, to fix GCC 4.8 build warning. Patch originally by dholbert.

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/22285002

git-svn-id: http://skia.googlecode.com/svn/trunk/include@10575 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed