Backport of "glcolorconvert: Fix external-oes shader" into 1.16
Backport of !369 (merged) "glcolorconvert: Fix external-oes shader".
Commits:
- 1b089ab0 glcolorconvert: Fix external-oes shader
Backport of !369 (merged) "glcolorconvert: Fix external-oes shader".
Commits: