Use 1 ref frame in intra-refresh mode. #497

Job	Run time
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	23m 35s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	14m 43s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	15m 8s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	22m 52s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=libretro	14m 43s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	14m 49s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	26m 11s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	16m 49s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	20m 39s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	19m 56s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=libretro	20m 54s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	17m 11s
	3h 47m 30s

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