Merge pull request #6805 from Goober5000/warn_about_bitmap_fonts #836

Job	Run time
Linux (Debug, clang-16)	9m 13s
Linux (Debug, gcc-9)	13m 0s
Linux (Release, gcc-9)	12m 41s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	9m 0s
Linux (Release, gcc-13)	7m 17s
Linux (Release, clang-16)	16m 21s
Linux (Debug, gcc-13)	2m 11s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	12m 3s
	1h 21m 46s

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