Adding mingw64-gtk4 and mingw64-libadwaita

[Sim Tov]

Dear mingw maintainers,

may I ask you, please, to add mingw64-gtk4 and mingw64-libadwaita to
Fedora, so people can start cross-compile modern GTK4 applications for
Windows.

BTW, is it possible to cross-compile mingw64-libadwaita and make Windows
builds of the applications convergent? It might be relevant for Windows
based tablets.

Gnome Text Editor requires this packages:

https://gitlab.gnome.org/GNOME/gnome-text-editor/-/issues/149

Thank you!