Backport of "build/gl: fix automatic dispmanx detection for rpi4" into 1.20
Backport of !3230 (merged) "build/gl: fix automatic dispmanx detection for rpi4".
Commits:
- 5ddb347a build/gl: fix automatic dispmanx detection for rpi4
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Backport of !3230 (merged) "build/gl: fix automatic dispmanx detection for rpi4".
Commits: