exclude src/opts/SkXbyak.cpp from g3 build

Change-Id: I5027275446ab9cc7fc7b12b2236a9d85ac50bef1
Reviewed-on: https://skia-review.googlesource.com/6695
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed