tests: Use g_test_message() rather than fprintf()

This ensures that the output is redirected properly, and prefixed with
`#` when outputting in TAP mode, so that it doesn’t confuse the TAP
format parser.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

glib/tests/unicode-normalize.c

@@ -121,7 +121,7 @@ test_unicode_normalize (void)
 	goto next;
       if (buffer->str[0] == '@') /* Part */
 	{
-	  fprintf (stderr, "\nProcessing %s\n", buffer->str + 1);
+	  g_test_message ("Processing %s", buffer->str + 1);
 	  goto next;
 	}