Use writeonly. #478

Job	Run time
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	27m 57s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	22m 46s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	24m 9s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	31m 15s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=libretro	26m 8s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	27m 43s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	20m 1s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	20m 2s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	21m 12s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	20m 43s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=libretro	24m 12s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	20m 49s
	4h 46m 57s

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