Add qemu support for ppc64 on FC16 or above for rpm packaging

On Fedora16 or above, qemu is supported now. So it is added
in rpm packaging.
Signed-off-by: NLi Zhang <zhlcindy@linux.vnet.ibm.com>

AUTHORS

@@ -225,6 +225,7 @@ Patches have also been contributed by:
   Benjamin Cama        <benoar@dolka.fr>
   Duncan Rance         <libvirt@dunquino.com>
   Peng Zhou            <ailvpeng25@gmail.com>
+  Li Zhang             <zhlcindy@linux.vnet.ibm.com>
 
   [....send patches to get your name here....]
 

libvirt.spec.in

@@ -139,8 +139,8 @@
 %define with_xen 0
 %endif
 
-# Fedora doesn't have any QEMU on ppc64 - only ppc
-%if 0%{?fedora}
+# Fedora doesn't have any QEMU on ppc64 until FC16 - only ppc
+%if 0%{?fedora} && 0%{?fedora} < 16
 %ifarch ppc64
 %define with_qemu 0
 %endif