libvirt.spec.in: Adapt to newest wireshark plugindir
libvirt.spec.in: Adapt to newest wireshark plugindir

In the old days, when wireshark plugin was introduced it was
installed under /usr/lib64/wireshark/plugins/$VERSION/ while with
wireshark-2.1.0 this path has changed just to
/usr/lib64/wireshark/plugins. We should teach our spec file about
this change.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

datto/libvirt,fabianfreyer/libvirt,taget/libvirt,jfehlig/libvirt,andreabolognani/libvirt,eskultety/libvirt,crobinso/libvirt,nertpinx/libvirt,eskultety/libvirt,datto/libvirt,jardasgit/libvirt,taget/libvirt,eskultety/libvirt,crobinso/libvirt,eskultety/libvirt,datto/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,zippy2/libvirt,jardasgit/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jardasgit/libvirt,taget/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,olafhering/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,zippy2/libvirt,zippy2/libvirt,taget/libvirt,VenkatDatta/libvirt,taget/libvirt,VenkatDatta/libvirt,libvirt/libvirt,olafhering/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,jfehlig/libvirt,datto/libvirt,olafhering/libvirt,nertpinx/libvirt,crobinso/libvirt,eskultety/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,datto/libvirt,fabianfreyer/libvirt,zippy2/libvirt