systemd: Only set @sockmode@ once

The decision is based only on whether Polkit support is enabled,
so there's no need to go through it again for every single
service.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

src/meson.build

@@ -797,13 +797,13 @@ if conf.has('WITH_LIBVIRTD')
       install_dir: systemd_unit_dir,
     )
 
-    foreach unit : virt_daemon_units
-      if conf.has('WITH_POLKIT')
-        sockmode = '0666'
-      else
-        sockmode = '0600'
-      endif
+    if conf.has('WITH_POLKIT')
+      sockmode = '0666'
+    else
+      sockmode = '0600'
+    endif
 
+    foreach unit : virt_daemon_units
       unit_conf = configuration_data({
         'runstatedir': runstatedir,
         'sbindir': sbindir,