patch 8.0.0447: getting font name does not work on X11

Problem:    Getting font name does not work on X11.
Solution:   Implement gui_mch_get_fontname() for X11.  Add more GUI tests.
            (Kazunobu Kuriyama)
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index ca8597f..ce1c24c 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -138,7 +138,7 @@
 
 test_gui_init.res: test_gui_init.vim
 	@echo "$(RUN_GVIMTEST_WITH_GVIMRC)" > vimcmd
-	$(RUN_VIMTEST) -u NONE -U gui_init.vim $(NO_PLUGINS) -S runtest.vim $<
+	$(RUN_VIMTEST) -u gui_preinit.vim -U gui_init.vim $(NO_PLUGINS) -S runtest.vim $<
 	@rm vimcmd
 
 opt_test.vim: ../option.c gen_opt_test.vim