build: meson: Add trailing commas

Add missing trailing commas that avoids getting noise when another
file/parameter is added and eases reviewing changes[0].

[0] https://gitlab.gnome.org/GNOME/dconf/merge_requests/11#note_291585

data/meson.build

@@ -13,7 +13,7 @@ configure_file(
   output: server,
   install: true,
   install_dir: join_paths(nm_datadir, 'doc', nm_name, 'examples'),
-  configuration: data_conf
+  configuration: data_conf,
 )
 
 if install_systemd_unit_dir
@@ -34,14 +34,14 @@ if install_systemd_unit_dir
       output: service,
       install: true,
       install_dir: systemd_system_unit_dir,
-      configuration: data_conf
+      configuration: data_conf,
     )
   endforeach
 
   if enable_ovs
     install_data(
       'NetworkManager-ovs.conf',
-      install_dir: join_paths(systemd_system_unit_dir, 'NetworkManager.service.d')
+      install_dir: join_paths(systemd_system_unit_dir, 'NetworkManager.service.d'),
     )
   endif
 endif
@@ -50,12 +50,12 @@ if install_udev_dir
   data = files(
     '84-nm-drivers.rules',
     '85-nm-unmanaged.rules',
-    '90-nm-thunderbolt.rules'
+    '90-nm-thunderbolt.rules',
   )
 
   install_data(
     data,
-    install_dir: join_paths(udev_dir, 'rules.d')
+    install_dir: join_paths(udev_dir, 'rules.d'),
   )
 endif
 
@@ -65,7 +65,7 @@ if enable_polkit
   policy_in = configure_file(
     input: policy + '.in.in',
     output: policy + '.in',
-    configuration: data_conf
+    configuration: data_conf,
   )
 
   custom_target(
@@ -74,6 +74,6 @@ if enable_polkit
     output: policy,
     command: intltool_xml_cmd,
     install: true,
-    install_dir: polkit_dir
+    install_dir: polkit_dir,
   )
 endif