Avoid trying to load version-mismatched Qt plugins on NixOS #234

Job	Run time
i386 appimage	7m 10s
x86_64 appimage	5m 37s
aarch64 appimage	6m 48s
x86_64 coverage	5m 44s
armhf appimage	9m 5s
Create release and upload artifacts	6s
	34m 30s

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