[Libvir] 1/22 Pull in more Gnulib modules

This pulls in some extra modules that we need: sys_stat (provides things like the S_* permissions flags which are missing under Windows) vasprintf (asprintf implementation) stdndup strsep poll gettext (portable gettext and <libintl.h> support) getpass (discussed previously) Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903