Upgrade GTK+3 and dependencies

These upgrades depend on the GLib upgrade (2.44.0) sent earlier by Robert Yang (in git.openembedded.org/openembedded-core-contrib rbt/PU).

The patchset includes many 'firsts' for me so feedback is welcome. Things of note:
* virtual/mesa is used as dependency when gtk+3 needs wayland-egl -- is this correct?
* The libepoxy recipe is new. Patching the dependency out of GTK+ might be possible but epoxy is quite small so I assumed adding a recipe is ok.

The following changes since commit 7fb6a6e907e5803597b2e12ba7047c46e57dba26:

upstream_tracking.inc: Add no-update reason for gdk-pixbuf (2015-04-09 10:01:48 +0100)

are available in the git repository at:

git://git.yoctoproject.org/poky-contrib jku/update-gtk3
http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=jku/update-gtk3

Jussi Kukkonen (7):
glib-networking: Upgrade to 2.44.0
cairo: Upgrade to 1.14.2
atk: Upgrade to 2.16.0
at-spi2-core: Upgrade to 2.16.0
at-spi2-atk: Upgrade to 2.16.0
libepoxy: Add as GTK+ 3.16 requirement
gtk+3: Upgrade to 3.16.0

 .../conf/distro/include/upstream_tracking.inc      |  1 -
 ...working_2.38.0.bb => glib-networking_2.44.0.bb} |  4 +--
 meta/recipes-gnome/gtk+/gtk+3.inc                  | 14 ++++-----
 ...ve-includedir-poisoning-from-configure.ac.patch | 34 ++++++++++++++++++++++
 .../gtk+/gtk+3/fix-flags-for-native.patch          | 33 ---------------------
 .../gtk+/{gtk+3_3.12.2.bb => gtk+3_3.16.0.bb}      |  6 ++--
 .../cairo/{cairo_1.12.18.bb => cairo_1.14.2.bb}    |  4 +--
 meta/recipes-graphics/libepoxy/libepoxy_1.2.bb     | 16 ++++++++++
 ...at-spi2-atk_2.14.1.bb => at-spi2-atk_2.16.0.bb} |  4 +--
 ...-spi2-core_2.14.1.bb => at-spi2-core_2.16.0.bb} |  7 +++--
 .../atk/{atk_2.14.0.bb => atk_2.16.0.bb}           |  4 +--
 11 files changed, 72 insertions(+), 55 deletions(-)
 rename meta/recipes-core/glib-networking/{glib-networking_2.38.0.bb => glib-networking_2.44.0.bb} (88%)
 create mode 100644 meta/recipes-gnome/gtk+/gtk+3/Remove-includedir-poisoning-from-configure.ac.patch
 delete mode 100644 meta/recipes-gnome/gtk+/gtk+3/fix-flags-for-native.patch
 rename meta/recipes-gnome/gtk+/{gtk+3_3.12.2.bb => gtk+3_3.16.0.bb} (73%)
 rename meta/recipes-graphics/cairo/{cairo_1.12.18.bb => cairo_1.14.2.bb} (92%)
 create mode 100644 meta/recipes-graphics/libepoxy/libepoxy_1.2.bb
 rename meta/recipes-support/atk/{at-spi2-atk_2.14.1.bb => at-spi2-atk_2.16.0.bb} (79%)
 rename meta/recipes-support/atk/{at-spi2-core_2.14.1.bb => at-spi2-core_2.16.0.bb} (68%)
 rename meta/recipes-support/atk/{atk_2.14.0.bb => atk_2.16.0.bb} (79%)

2.1.4