[Merge] lp:~gerboland/qtubuntu/adopt-more-eglconvenience2 into lp:qtubuntu

[Gerry Boland]

I did test on my more modern Intel machine and found the context returned by Mesa was the highest it supported. But yeah, I'll try to use it as a fallback-only position
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https://code.launchpad.net/~gerboland/qtubuntu/adopt-more-eglconvenience2/+merge/295248
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