Compiler warning cleanup
- gitlab CI: stop requiring
Signed-off-byin commits - constify some argument declarations
- S3VSetupImageVideoOverlay: Fix 44
-Wnull-dereferencewarnings from gcc - S3VSetCursorColors: quiet
-Wimplicit-fallthroughwarnings
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Signed-off-by in commits-Wnull-dereference warnings from gcc-Wimplicit-fallthrough warnings