Merge pull request #6359 from Goober5000/waypoint_pointer_to_index #1723

Job	Run time
Linux (Debug, gcc-9)	12m 52s
Linux (Debug, gcc-13)	9m 40s
Linux (Debug, clang-16)	11m 11s
Linux (Release, gcc-9)	8m 14s
Linux (Release, gcc-13)	9m 10s
Linux (Release, clang-16)	10m 32s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	10m 21s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	9m 15s
	1h 21m 15s

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