[openSUSE][RPM] Some more refinements of inter-subpackage dependencies

Add some block drivers and virtiofsd as hard dependencies of the
qemu-headless package, to make sure it's really useful for headless
server environments (even when recommended packages are not installed).

Singed-off-by: Dario Faggioli <dfaggioli@suse.com>

rpm/qemu.spec

@@ -1014,7 +1014,10 @@ necessary for having SPICE working for your VMs.
 Summary:        Minimum set of packages for having a functional QEMU
 Group:          System/Emulators/PC
 Requires:       qemu
+Requires:       qemu-block-curl
+Requires:       qemu-block-nfs
 Requires:       qemu-img
+Requires:       virtiofsd
 %if %{legacy_qemu_kvm}
 Requires:       qemu-kvm
 %endif