Add extra_asmflags

This makes it easier to cross-compile for non-Android ARM (e.g. Raspberry PI)

Bug: skia:
Change-Id: I4414d933bc38d56009aefcbe10e68f7c70964d9c
Reviewed-on: https://skia-review.googlesource.com/10291
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed