Grab patch from upstream to fix the build.

One of the patches cherry picked to the 3.14 branch depends on a glib API
added in the 2.44 series. Add a patch from upstream to allow build with
glib 2.42 in ports.

PR:		201951 [1]
Reported by:	Walter Schwarzenfeld, Gary <freebsd-bugzilla@in-addr.com> [1]
Obtained from:	upstream gtk+ 3.14 branch

x11-toolkits/gtk30/files/patch-34e6e1a

@@ -0,0 +1,28 @@
+From 34e6e1a599375da5665f4829faedf4c640f031a6 Mon Sep 17 00:00:00 2001
+From: Matthias Clasen <mclasen@redhat.com>
+Date: Tue, 21 Jul 2015 12:03:52 -0400
+Subject: Avoid g_set_object
+
+One of the backported fixes brought in a dependency on new glib
+that I didn't mean to introduce here. Avoid it.
+
+diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
+index 364c382..8ff85ce 100644
+--- gtk/gtkdnd.c
++++ gtk/gtkdnd.c
+@@ -3258,7 +3258,11 @@ set_icon_helper (GdkDragContext *context,
+ 
+       info = gtk_drag_get_source_info (context, FALSE);
+ 
+-      g_set_object (&info->icon_helper, helper);
++      if (helper)
++        g_object_ref (helper);
++      if (info->icon_helper)
++        g_object_unref (info->icon_helper);
++      info->icon_helper = helper;
+       gtk_drag_set_icon_window (context, NULL, hot_x, hot_y, TRUE);
+     }
+   else
+-- 
+cgit v0.10.2
+