Merge pull request #5920 from MjnMixael/properly_check_windowed #550

Job	Run time
Linux (Debug, gcc-5)	8m 25s
Linux (Debug, gcc-13)	9m 53s
Linux (Debug, clang-16)	10m 44s
Linux (Release, gcc-5)	6m 39s
Linux (Release, gcc-13)	8m 13s
Linux (Release, clang-16)	10m 44s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	9m 15s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	8m 32s
	1h 12m 25s

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