d/not-installed: Use multi-arch dirs

Files moved during the dh12 switch.

debian/not-installed

 # libtool files for the shared libraries, not needed by end user
 usr/lib/*/*libvirt*.la
-usr/lib/libvirt/storage-file/libvirt_storage*.la
-usr/lib/libvirt/storage-backend/libvirt_storage_backend*.la
-usr/lib/libvirt/lock-driver/*.la
-usr/lib/libvirt/connection-driver/*.la
+usr/lib/*/libvirt/storage-file/libvirt_storage*.la
+usr/lib/*/libvirt/storage-backend/libvirt_storage_backend*.la
+usr/lib/*/libvirt/lock-driver/*.la
+usr/lib/*/libvirt/connection-driver/*.la