qt: workaround for `undefined reference to `qt_version_tag'` error
KF6WindowSystem requires Qt6Gui, but not Qt6Core. And Qt6Gui does not require Qt6Core.
The symbol qt_version_tag is available in Qt6Core.
Request review @chub.
KF6WindowSystem requires Qt6Gui, but not Qt6Core. And Qt6Gui does not require Qt6Core.
The symbol qt_version_tag is available in Qt6Core.
Request review @chub.
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