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Improve panic messages if retrieving/parsing GL_VERSION fails #474

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Job	Run time
lint	12s
build (pinned)	1m 59s
build (stable)	1m 46s
build (beta)	1m 45s
build (nightly)	1m 40s
build (macos)	1m 1s
build (windows)	3m 0s
	11m 23s