Use clang versions of SK_RESTRICT and SK_WARN_UNUSED_RESULT on Windows

Bug: skia:
Change-Id: I63bc32c7bba294d8698d17e1f178ca0eb0a84ddf
Reviewed-on: https://skia-review.googlesource.com/c/191295
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed