Fix Linux OpenGL compositor on ARM driver - #166753

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@robert-ancell I agree that the implementation using blit should be investigated further.
I suspect the "glBlitFramebuffer" function itself works on all the drivers, it just has some more requirements.
If I ever get to investigate further, I'll let you know / make another PR.

I added it to the autosubmit queue. But this might need to be rebased and submitted again.

autosubmit label was removed for flutter/flutter/166753, because This PR has not met approval requirements for merging. The PR author is not a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.

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autosubmit label was removed for flutter/flutter/166753, because Pull request flutter/flutter/166753 is not in a mergeable state.