Fix Dawn's path to spirv-cross.

With SPVC deprecated, Dawn contains its own build files for SPIRV-Cross
so the path to the SPIRV-Cross repo needed to be fixed.

Change-Id: If8765d74f3373e3e4a5366ebdd6e35f41b547943
Bug: None
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/315376
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed