remove unused functions in sksl.inc

Bug: skia:
Change-Id: I8f791324bbde13d51c7be2b85ee5d5fadb938e5e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/215423
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed