[Libvir] [PATCH] No rpcgen at all

If there is no 'rpcgen' program at all then ./configure fails. It should not, because rpcgen is not necessary to build libvirt. Patch fixes. 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