Merge pull request #6325 from Goober5000/probability-curves-followup #680

Job	Run time
Linux (Debug, gcc-9)	11m 7s
Linux (Debug, gcc-13)	8m 49s
Linux (Debug, clang-16)	10m 48s
Linux (Release, gcc-9)	6m 51s
Linux (Release, gcc-13)	7m 33s
Linux (Release, clang-16)	10m 20s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	9m 33s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	8m 20s
	1h 13m 21s

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