tests: Add DBus server binary

This should facilitate DBus API testing.

tests/services/meson.build

@@ -0,0 +1,20 @@
+t = executable('calls-dbus-server', 'calls-server.c',
+                 dbus_config_h,
+                 calls_sources,
+                 c_args : test_cflags,
+                 link_args: test_link_args,
+                 pie: true,
+                 link_with : [calls_vala, libcalls],
+                 dependencies: calls_deps,
+                 include_directories : [
+                   calls_includes,
+                   test_includes,
+                 ]
+                )
+
+service_file = 'org.gnome.Calls.service'
+
+service = configure_file (
+  input         : service_file + '.in',
+  output        : service_file,
+  configuration : dbus_service_conf)