mac ninja&make: Support GCC_ENABLE_SSE3_EXTENSIONS and friends. Review URL: https://chromiumcodereview.appspot.com/9402033
mac ninja&make: Support GCC_ENABLE_SSE3_EXTENSIONS and friends.
Review URL: https://chromiumcodereview.appspot.com/9402033

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1203 78cadc50-ecff-11dd-a971-7dbc132099af

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