Msys2 sdl2-client installer with gtk4-fcmp
Once #43066 creates msys2 environment with gtk4 in it, it will be possible to start building freeciv-mp-gtk4 for the sdl2-client package.
This depends on #43243
Once #43066 creates msys2 environment with gtk4 in it, it will be possible to start building freeciv-mp-gtk4 for the sdl2-client package.