Fix MSVC noreturn definition

Previous version was causing noreturn functions in headers to be
annotated with __declspec(__declspec(noreturn)).

Change-Id: I1c841d974ec33efdd5483d6ca712ea247244e1b8
Reviewed-on: https://skia-review.googlesource.com/95565
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed