[libvirt] [PATCH] avoid problem for parallel buld in python subdir

Seems very hard to hit but one could get a problem with generation of the python bindings, https://bugzilla.redhat.com/show_bug.cgi?id=463733 the enclosed patch is by Dan Berrange Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel@veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/