Merge pull request #7151 from notimaginative/cmake_path_variable_fix #2299

Job	Run time
Linux (Debug, gcc-13)	13m 50s
Linux (Release, clang-16)	21m 9s
Linux (Debug, clang-16)	8m 37s
Linux (Release, gcc-9)	22m 8s
Linux (Release, gcc-13)	17m 6s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	14m 42s
Linux (Debug, gcc-9)	16m 28s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	10m 46s
	2h 4m 46s

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