Avoid errors about re-defining __STDC_FORMAT_MACROS

Bug: skia:
Change-Id: I880e3d5a668743ac12fb0101baca637443e920b4
Reviewed-on: https://skia-review.googlesource.com/33082
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed