gfio: remove warning on g_type_init() being deprecated

Compile throws this on newer glib:

gfio.c: In function ‘init_ui’:
gfio.c:1690:2: warning: ‘g_type_init’ is deprecated (declared at /usr/include/glib-2.0/gobject/gtype.h:667) [-Wdeprecated-declarations]
  g_type_init();
  ^

Fix it with a GLIB_CHECK_VERSION() check for 2.36.0.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/gfio.c b/gfio.c
index 37c1db6..0e22cba 100644
--- a/gfio.c
+++ b/gfio.c
@@ -1687,7 +1687,9 @@
 	gtk_init(argc, argv);
 	settings = gtk_settings_get_default();
 	gtk_settings_set_long_property(settings, "gtk_tooltip_timeout", 10, "gfio setting");
+#if !GLIB_CHECK_VERSION(2, 36, 0)
 	g_type_init();
+#endif
 	gdk_color_parse("#fffff4", &gfio_color_lightyellow);
 	gdk_color_parse("white", &gfio_color_white);