Check that we do not #define WUFFS_IMPLEMENTATION

Bug: skia:8235
Change-Id: Ie36301acf1779c8c33f69d9dfc986562d96992c7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/199441
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
1 file changed