Update gtk3 to 3.8.4

3.8.4: Remove unintentional use of GLib 2.37 apis

3.8.3:
* Bugs fixed:
667759 gtkdnd-quartz.c is missing annotations for introspection
672271 File chooser seems over-enthusiastic about using subdir...
674108 Hard crash due to wrong NSAutoreleasePool stacking
680953 set_item_width / text wrapping doesn't work in iconview...
688738 GtkMenuButton problem with mnemonics / accelerators
691921 GTK+ (quartz) built on Mac OS X 10.5 references [NSMenu...
692548 Quartz: Cursor doesn't reset when the mouse leaves a to...
694273 Patch to support NSTextInputClient in text widgets
694755 When clicking Activities, sometimes gnome-shell crashes.
696498 can't set download folder
696640 GtkButton: Don't suppress unhandled mouse events
698183 Text input is too slow and some keys are broken after c...
698758 Wrong limit for "Native Windows wider or taller than 65...
700185 GtkWindow: problem with child widget visibility
700779 gtk_menu_item_draw puts the arrow too close to the border
701332 Patch for minor glitch in NSTextInput
701341 Windows only paint once in Weston 1.1
701365 Do not assert sm_proxy != NULL in GtkApplication inhibi...
701613 XEmbed doesn't work with frame-synced GTK/Mutter
702598 Invalid read of size 4 in gtk_icon_info_get_embedded_rect
702763 ellipsize placeholder text
702913 Reduce hash table lookups in gdk_x11_screen_supports_ne...
703069 Opening a big menu activates some menu entry
703220 Memory allocation integer overflow in gdk_cairo_set_sou...
705181 Annoying beep on arrow keys when using IME on MacOS
705182 Reset Cocoa IME state when immodule is reset
705320 gtkicontheme: check for GdkPixbuf first
705692 Segmentation fault on horizontal slider
705750 Quartz input method doesn't work correctly for Chinese...
706152 g_object_notify called with NULL priv->focus_widget

* Translation updates:
Brazilian Portuguese
Traditional Chinese

(prlw1)