Add back a simple low latency mode. #457

Job	Run time
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	23m 28s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	23m 46s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	22m 37s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	22m 38s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=libretro	26m 16s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	22m 46s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	21m 43s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	22m 2s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	20m 38s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	20m 42s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=libretro	22m 7s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	20m 27s
	4h 29m 10s

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