[GL] Provide rowStride for SetPixelStoreUnpack in pixels instead of b… #1026

Job	Run time
build_linux (Full, Shared, Release)	4m 48s
build_linux (Full, Shared, Debug)	3m 37s
build_linux (Full, Static, Release)	4m 31s
build_linux (Full, Static, Debug)	5m 39s
build_linux (Limited, Shared, Release)	3m 33s
build_linux (Limited, Shared, Debug)	2m 55s
build_linux (Limited, Static, Release)	3m 32s
build_linux (Limited, Static, Debug)	4m 6s
	32m 41s

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