OpenGL: fixed adapter vendor detection (fix #678) #3393

Job	Run time
Linux -> Pre-checks	16s
Linux -> GCC-x64, Debug	11m 26s
Linux -> GCC-x64, Release	10m 19s
Linux -> Clang-x64, Debug	12m 47s
Linux -> Clang-x64, Release	12m 24s
Linux -> Clang-NO_GLSLANG-x64, Debug	7m 36s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 0s
	1h 0m 48s

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