Mimic Chrome better in our GYPs.

To match Chrome, make sure we've disabled thread-safe statics, RTTI, and exceptions.  Linux needed -fno-threadsafe-statics, Mac needed all three.

Nothing important triggered this CL.  I just got confused when I saw exception handling (calls to delete, stack unwinding) in some generated code on my laptop.

BUG=skia:

Review URL: https://codereview.chromium.org/1323533003
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