glib/tests/constructor: Add test dependency on constructor_lib

Otherwise we may build the test but not its dependent library

glib/tests/meson.build

@@ -352,6 +352,7 @@ if host_machine.system() == 'windows' or have_dlopen_dlsym
                  '-DBUILD_TEST_EXECUTABLE',
                  '-DPREFIX=app'],
       'dependencies' : libdl_dep,
+      'depends': constructor_lib,
       'link_with': [constructor_helper]
     }
   }