spec: make client-only testing easier
spec: make client-only testing easier

Several recent patches cleaned up 'make rpm' for the situation
when client_only is true; these were done by manual spec file
editing (since it's relatively hard to come by a RHEL 5 s390
box).  Make it easier to do in the future via a simpler command
line override.

* libvirt.spec.in (client_only): Allow for override.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

elmarco/libvirt,VenkatDatta/libvirt,libvirt/libvirt,rlaager/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,taget/libvirt,jardasgit/libvirt,taget/libvirt,datto/libvirt,shugaoye/libvirt,libvirt/libvirt,andreabolognani/libvirt,jfehlig/libvirt,nertpinx/libvirt,agx/libvirt,nertpinx/libvirt,taget/libvirt,taget/libvirt,jfehlig/libvirt,andreabolognani/libvirt,datto/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,elmarco/libvirt,andreabolognani/libvirt,zippy2/libvirt,eskultety/libvirt,VenkatDatta/libvirt,eskultety/libvirt,elmarco/libvirt,crobinso/libvirt,jfehlig/libvirt,shugaoye/libvirt,olafhering/libvirt,rlaager/libvirt,cbosdo/libvirt,olafhering/libvirt,datto/libvirt,nertpinx/libvirt,taget/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,libvirt/libvirt,cbosdo/libvirt,rlaager/libvirt,crobinso/libvirt,olafhering/libvirt,VenkatDatta/libvirt,olafhering/libvirt,datto/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,eskultety/libvirt,fabianfreyer/libvirt,agx/libvirt,cbosdo/libvirt,elmarco/libvirt,agx/libvirt,datto/libvirt,nertpinx/libvirt,shugaoye/libvirt,jardasgit/libvirt,eskultety/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,jfehlig/libvirt,jardasgit/libvirt,shugaoye/libvirt,cbosdo/libvirt,elmarco/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,jardasgit/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,shugaoye/libvirt,andreabolognani/libvirt,agx/libvirt