disable warnings in ANGLE

We already actively don't turn on more warnings; this disables what must
be default warnings.  This is the same logic we apply in our usual
third_party() template (see third_party/third_party.gni).

Change-Id: Icc164f8d288005baf1f0a1c7d408054acc7d4701
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260881
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed