build: Make input-capture use declarative D-Bus code generation

This was cleaned up, but a input capture rebased didn't port to the new
way of declaring what D-Bus protocol files that should go through code
generation.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3432>

src/meson.build

@@ -924,6 +924,11 @@ dbus_interfaces = [
     'prefix': 'org.gnome.Mutter.',
     'object_manager': true,
   },
+  {
+    'name': 'meta-dbus-input-capture',
+    'interface': 'org.gnome.Mutter.InputCapture.xml',
+    'prefix': 'org.gnome.Mutter',
+  },
   {
     'name': 'meta-dbus-input-mapping',
     'interface': 'org.gnome.Mutter.InputMapping.xml',
@@ -1036,13 +1041,6 @@ foreach dbus_interface: dbus_interfaces
   mutter_built_sources += dbus_sources
 endforeach
 
-dbus_input_capture_built_sources = gnome.gdbus_codegen('meta-dbus-input-capture',
-    dbus_interfaces_dir / 'org.gnome.Mutter.InputCapture.xml',
-    interface_prefix: 'org.gnome.Mutter',
-    namespace: 'MetaDBus',
-)
-mutter_built_sources += dbus_input_capture_built_sources
-
 wayland_protocol_server_headers = []
 wayland_protocol_client_headers = []
 wayland_protocol_sources = []

src/tests/meson.build

@@ -322,7 +322,7 @@ if have_native_tests
       'input-capture-test-client.c',
       '../backends/meta-fd-source.c',
       '../backends/meta-fd-source.h',
-      dbus_input_capture_built_sources,
+      built_dbus_sources['meta-dbus-input-capture'],
     ],
     include_directories: tests_includes,
     c_args: [