Packaging problem on Linux with Qt 5.15.0

[jamesobutler (James Butler)]

@cpinter

Do you guys remember how adding it broke the Windows packaging?

It led to the following on Windows:

@Lucas_Formighieri

I kept receiving messages saying a series of dll files were missing (Qt5Core, Qt5Gui, Qt5Network, Qt5WebChannel, Qt5WebEngineWidgets, Qt5Widgets and Qt5Xml).

and on Linux:

@Julio_Torres

qt.qpa.plugin: Could not load the Qt platform plugin “xcb” in “” even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.