This is needed for current Debian stable (Squeeze).

VTE versions before 0.26 did not support VtePty.

Lower the version requirement and use alternate code which works for Debian.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Message-id: 1361560199-28906-1-git-send-email-sw@weilnetz.de
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>