Fixed namespace conflict about find_next_free_port() parameter "interface" on
Windows.

See bug #21546


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24258 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Build modpack installer gui consistent with the client selection for Windows
installer packages.

See bug #21474


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24261 a0f10bec-cc02-0410-94fc-a9cfff90b4cd