Backport of "glslstage: delete shader on finalize of stage" into 1.18
Backport of !886 (merged) "glslstage: delete shader on finalize of stage".
Commits:
- c9d15fec glslstage: delete shader on finalize of stage
Backport of !886 (merged) "glslstage: delete shader on finalize of stage".
Commits: