Merge pull request #467 from ghutchis/fix-qt6-build #643

Job	Run time
Ubuntu GCC	32m 15s
Ubuntu AppImage	32m 43s
macOS Latest Clang	1h 2m 12s
Windows Latest MSVC	1h 17m 39s
Ubuntu Address Sanitizer	32m 18s
Ubuntu Leak Sanitizer	55m 12s
Ubuntu Thread Sanitizer	53m 24s
Ubuntu Undefined Behavior Sanitizer	28m 37s
	6h 14m 20s

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