Add GPU timestamps for RGB-YUV encode. #503

Job	Run time
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	8m 32s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	8m 34s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	8m 32s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	8m 28s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=libretro	8m 15s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	8m 37s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	8m 33s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	8m 17s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	8m 35s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	8m 33s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=libretro	8m 27s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	8m 34s
	1h 41m 57s

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