Add dynamic rate control mode for audio decode. #436

Job	Run time
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	11m 17s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	10m 55s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	12m 12s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	11m 17s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=libretro	11m 18s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	11m 33s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	11m 15s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	11m 17s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	11m 18s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	11m 16s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=libretro	11m 15s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	11m 15s
	2h 16m 8s

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