Fix: [OpenGL] Don't use OpenGL on MESA software renderers. #8758
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Motivation / Problem
MESA software OpenGL is slower than not using it.
Description
Just block it and let OpenTTD fallback to another video dirver.
Limitations
If the reported renderer string changes, the test might fail in the future.
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.