Add toolchain file for x86 macos cmake builds.
BUG=https://bugs.chromium.org/p/aomedia/issues/detail?id=76 Change-Id: I14dd6704450a06898ca1bc5c0f4f9b21316c4df1
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BUG=https://bugs.chromium.org/p/aomedia/issues/detail?id=76 Change-Id: I14dd6704450a06898ca1bc5c0f4f9b21316c4df1