Fix #8825: [OpenGL] Don't clear cursor cache from the game loop thread. #8826
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Motivation / Problem
OpenGL functions may no be called from other threads except the main thread, which could happen when clearing the cursor cache.
Description
Queue the pending clear until the next time the main thread prepares the cursor cache for drawing.
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.