Msys2 Makefile.meson: Package gtk3.22-client to installer
Add support for building installer package from gtk3.22-client, and initially only of freeciv gtk3.22-client. As dependencies (from msys2 environment) are not included to the installer, it won't be working one yet.
Add support for building installer package from gtk3.22-client, and initially only of freeciv gtk3.22-client. As dependencies (from msys2 environment) are not included to the installer, it won't be working one yet.