Msys2 / Makefile.meson built win32 client can't find port for server
This happens also with 211115 msys2 environment, so not a regression with the new environment.
There seems to be two parts to this:
1) Configure step does not find 'getaddrinfo()'
2) Currently our meson build has FREECIV_IPV6_SUPPORT hardcoded, even though it can't be built without getaddrinfo()
- Minor style improvement
win32 version of the msys2 Makefile.meson built gtk3.22-client can't fork the server, but says that it does not find a free port for that. This is with the 220309 msys2 environment (currently in testing, not yet in use). Gtk3.22-client is the only installer that can currently be built by the Makefile.meson.