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glamor/egl: Avoid crashing on broken configurations

Adam Jackson requested to merge ajax/xserver:broken-gl-paranoia into master

0a9415cf apparently can tickle bugs in the GL stack where glGetString returns NULL, presumably because the eglMakeCurrent() didn't manage to actually install a dispatch table and you're hitting a stub function. That's clearly not our bug, but if it happens we should at least not crash. Notice this case and fail gently.

Signed-off-by: Adam Jackson

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