Also don't build lo_server_new_multicast_iface() if getifaddrs() is not present.
Also don't build lo_server_new_multicast_iface() if getifaddrs() is not present.

Although it doesn't have a direct dependency, better not to include
any *_iface() functions if interface selection cannot be performed, in
order to help any configure scripts that need to determine
capabilities.

git-svn-id: eb2ed70f8ecdcb6511b104a3e55a8be155f8dd4a@206 8a0476ba-7714-0410-bd95-fb3ea4a72f84

johne53/MB3Liblo,kneitinger/liblo,radarsat1/liblo,tuscland/liblo,island-org/liblo,kneitinger/liblo,radarsat1/liblo,tuscland/liblo,island-org/liblo,kneitinger/liblo,tuscland/liblo,umlaeute/liblo,fsateler/liblo,johne53/MB3Liblo,umlaeute/liblo,johne53/MB3Liblo,fsateler/liblo,johne53/MB3Liblo,radarsat1/liblo,fsateler/liblo,umlaeute/liblo,island-org/liblo