[graphite] Clean up SK_DISABLE_CLIP_DRAW_GEOMETRIC_INTERSECTION flag

Change-Id: I5ae9f4771f80bf96673afff81be287a8164d751e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1046116
Commit-Queue: Thomas Smith <thomsmit@google.com>
Reviewed-by: Thomas Smith <thomsmit@google.com>
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
1 file changed