[Libvir] 6/22 Disable console under MinGW

Under MinGW we don't have anything like termcap. This disables the console in virsh, replacing "virsh console" with an error message. 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