Fix standalone SkSL build

Change-Id: I54a4913e5ec2e9ed41d754c1f0cd2e6d7bbeb7a8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227640
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed