[GL] Provide rowStride for SetPixelStoreUnpack in pixels instead of bytes #422

Job	Run time
build_android (Shared, Release, x86_64)	2m 23s
build_android (Shared, Release, armeabi-v7a)	2m 15s
build_android (Shared, Debug, x86_64)	1m 49s
build_android (Shared, Debug, armeabi-v7a)	1m 55s
build_android (Static, Release, x86_64)	2m 20s
build_android (Static, Release, armeabi-v7a)	2m 14s
build_android (Static, Debug, x86_64)	2m 3s
build_android (Static, Debug, armeabi-v7a)	1m 59s
	16m 58s

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