Merge pull request #6219 from Goober5000/lock_perspective_and_slew #647

Job	Run time
Linux (Debug, gcc-9)	11m 1s
Linux (Debug, gcc-13)	8m 58s
Linux (Debug, clang-16)	10m 37s
Linux (Release, gcc-9)	7m 8s
Linux (Release, gcc-13)	7m 56s
Linux (Release, clang-16)	10m 37s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	9m 24s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	8m 5s
	1h 13m 46s

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