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d26d9def80
Older versions of Xcode with clang reporting versions 4.[012] and 5.0 did not include support for __builtin_bswap16. Checking in this manner avoids using brittle version checks. Matches a change to libvpx: https://chromium-review.googlesource.com/305573 to fix: https://code.google.com/p/webm/issues/detail?id=1082 Change-Id: I23ea466ee1b53b12cd3fb45f65a2186c8dda95a1