Cleanup some redundant acquire/release barrier code. #592

Job	Run time
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=SDL	20m 25s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	15m 46s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=SDL	19m 50s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=libretro	14m 34s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=SDL	19m 30s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	18m 15s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=SDL	27m 38s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=libretro	17m 30s
	2h 33m 28s

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