spec: Enable hyperv driver on RHEL

Resolves: https://redhat.atlassian.net/browse/RHEL-187057
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>

libvirt.spec.in

@@ -145,7 +145,6 @@
     %define with_vbox 0
     %define with_vmware 0
     %define with_libxl 0
-    %define with_hyperv 0
     %define with_lxc 0
     %define with_ch 0
 %endif