Backport of "glshader: fix default external-oes shaders" into 1.16
Backport of !233 (merged) "glshader: fix default external-oes shaders".
Commits:
- 15cb8643 glshader: fix default external-oes shaders
Backport of !233 (merged) "glshader: fix default external-oes shaders".
Commits: