Reduce DSLCore error-checking further.

DSLCore shouldn't be responsible for verifying that the ProgramKind
can accept an InterfaceBlock.

Change-Id: Iac7aabe7e807428367ad10d3954106dbb6678a1f
Bug: skia:13821
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/594809
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2 files changed