Patch to make servers listen on multiple interfaces.

Changed servers.c to enable root servers to listen and accept
connections on multiple IP interfaces/addresses. Added comments
to the server configuration files about defining CSV list of IP
addresses for server to listen on. Changed Makefile.am to compile
& link iopause routines to servers.

http://ftp.uni-erlangen.de/pub/mirrors/gentoo/distfiles/djbdns-1.05-multiip.diff