gio/tests: Use default log writer to stderr for launched processes

We don't want to bother TAP parser with subprocess messages when using
verbose logging, so let's just use stderr by default.

gio/tests/fake-document-portal.c

@@ -125,6 +125,8 @@ main (gint argc, gchar *argv[])
   GMainLoop *loop;
   guint id;
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   loop = g_main_loop_new (NULL, FALSE);
 
   id = g_bus_own_name (G_BUS_TYPE_SESSION,

gio/tests/fake-service-name.c

@@ -98,6 +98,8 @@ main (gint argc, gchar *argv[])
 {
   guint id;
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   loop = g_main_loop_new (NULL, FALSE);
   introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
   g_assert (introspection_data != NULL);

gio/tests/gapplication.c

@@ -1686,6 +1686,8 @@ main (int argc, char **argv)
 {
   g_setenv ("LC_ALL", "C", TRUE);
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   g_test_init (&argc, &argv, NULL);
 
   if (!g_test_subprocess ())

gio/tests/gdbus-testserver.c

@@ -843,6 +843,8 @@ main (int argc, char *argv[])
 {
   guint owner_id;
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
   properties = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify)g_variant_unref);
   g_hash_table_insert (properties, g_strdup ("y"), g_variant_ref_sink (g_variant_new_byte (1)));