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/Make_ming.mak b/src/testdir/Make_ming.mak
index ad4697d..7e13c0f 100644
--- a/src/testdir/Make_ming.mak
+++ b/src/testdir/Make_ming.mak
@@ -129,7 +129,7 @@
 
 test_gui_init.res: test_gui_init.vim
 	@echo "$(VIMPROG)" > vimcmd
-	$(VIMPROG) -u NONE -U gui_init.vim $(NO_PLUGINS) -S runtest.vim $<
+	$(VIMPROG) -u gui_preinit_vim -U gui_init.vim $(NO_PLUGINS) -S runtest.vim $<
 	@$(DEL) vimcmd
 
 opt_test.vim: ../option.c gen_opt_test.vim