exclude *hsw* source files on Android/iOS G3 build.

Like *sse2*, *avx*, etc, these are x86-specific and
even there must be compiled with particular flags.

Change-Id: Ibbc004b9ba5da6da70449177423a785d2c644846
Reviewed-on: https://skia-review.googlesource.com/7623
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed