Update to 1.164.

Overview of changes in Gtk2 1.164
=================================

* Fix build and test suite issues.

Overview of changes in Gtk2 1.163
=================================

* Improve the documentation in many places.
* Fix many small memory leaks.
* Fix a few build and test suite issues.

Overview of changes in Gtk2 1.162
=================================

* Fix a strange parse error related to the use of qw// that occured on some
  versions of perl.  [Jeffrey Ratcliffe]

Overview of changes in Gtk2 1.161
=================================

* Fix a leak in Gtk2::Pango::Layout::get_iter.
* Fix a few test failures.

Overview of changes in Gtk2 1.160
=================================

Since 1.14x (the previous stable series)
----------------------------------------
* Add Gtk2::Pango::LayoutLine, Gtk2::Gdk::Pango::AttrEmbossColor,
  Gtk2::Builder, Gtk2::RecentAction, Gtk2::ScaleButton, and Gtk2::Tooltip.
* Add new API in: Gtk2::Gdk, Gtk2::Gdk::Color, Gtk2::Gdk::Display,
  Gtk2::Gdk::Event, Gtk2::Gdk::Keymap, Gtk2::Gdk::Pixbuf, Gtk2::Gdk::Window,
  Gtk2::Gdk::X11, Gtk2::Pango, Gtk2::Pango::Cairo, Gtk2::Pango::Color,
  Gtk2::Pango::Context, Gtk2::Pango::FontFace, Gtk2::Action,
  Gtk2::CellLayout, Gtk2::EntryCompletion, Gtk2::IconTheme, Gtk2::IconView,
  Gtk2::Layout, Gtk2::MenuToolButton, Gtk2::PageSetup, Gtk2::PrintSettings,
  Gtk2::Range, Gtk2::TextBuffer, Gtk2::TextMark, Gtk2::ToolItem,
  Gtk2::TreeView, Gtk2::Widget, and Gtk2::Window.
* Add support for pango attributes and pango gravity.

(xtraeme)