Fix semaphore support check on GrDirectContext::wait

Change-Id: Ifce5346b513b0caa291333c80effda7901bfb0c5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/403236
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed