[Fedora-xen] Bugfix for Xen hvmloader crash when compiled with gcc 4.6

[Pasi Kärkkäinen]

Hello,

There's a bug in Xen hvmloader, when compiled with gcc 4.6,
causing HVM guests crashing on startup.

Upstream xen.org fix is here: http://marc.info/?l=xen-devel&m=131117428320002
Fedora bugzilla entry: https://bugzilla.redhat.com/show_bug.cgi?id=723569

The bugfix patch should be added to both F15 and rawhide/F16 Xen rpms.

Thanks,

-- Pasi