Use gcc/clang builtins for av_sat_(add|sub)_64_c if available.
Signed-off-by: NDale Curtis <dalecurtis@chromium.org> Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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Signed-off-by: NDale Curtis <dalecurtis@chromium.org> Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>