Turn on -Wgnu-anonymous-struct and -Wnested-anonymous-types.

I'm not seeing any problems with these locally.  Perhaps the bots have something to say.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2709

Change-Id: I6f0c7045c8f270efcd71d837f22a40e9f9d3e9b7
Reviewed-on: https://skia-review.googlesource.com/2709
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
1 file changed