fixes fancy fetch.
Update gtk3 to 3.12.2

Highlights from changes:

* GtkPopover: A new widget that is can be used for transient
  views, as an alternative to menus or dialogs.
 - GtkMenuButton can use popovers instead of menus
* Client-side decorations:
 - Make F10 move focus to the header bar
 - Make header bars draggable on touch systems
 - Make shadows unclickable
* Printing: Google cloud print support
* GtkActionBar is a new widget that is meant to be used
  for actions at the bottom of a window.
* GtkAppChooserDialog has been redesigned

* GtkBox can now place a widget centered, regardless of
  the sizes of children on either side, similar to GtkHeaderBar.
* Dialogs:
 - Dialogs have been modernized, can use a header bar now
 - Built-in dialogs react to a setting, gtk-dialogs-use-header
   for this, dialogs derived from GtkDialog: default to no headerbar
 - GtkAssistant also respects the setting
* OS X:
 - Better menu integration. Items such as 'Hide', 'Hide Others'
   and 'Show All' are now handled specially
 - GTK+ provides a default application menu now
* Theming:
 - GTK+ now uses RGBA visuals by default
 - Notebook tabs now support a prelight state
 - Reorderable notebook tabs can be themed differently
* GtkActionBar: A new container, which has a centered
  child like GtkHeaderBar. It can be used in places
  where header bar theming is not suitable
* GtkAppChooser: The online support has been simplified
  and modernized
* GtkHeaderBar button theming has been changed to be
  more flexible. There is now a gtk-decoraton-layout
  setting and a decoration-layout property.
* Accessibility:
  - Links in labels are now accessible
  - Model-based menus are accessible
  - Accessible roles of several widgets have been fixed
  - GtkColorChooser accessibility is improved
* Theming: The Raleigh theme has been updated for
  several new features, including client-side decorations
* Model-based menus now support a hidden-when attribute
  on items that allows them to be hidden on various
  conditions
* New notebook tab styling: GtkNotebook now offers a way
  for themes to opt out of the tab rendering, with the
  'has-tab-gap' style property. The Adwaita theme is using
  this to achieve a more modern tab appearance.
* GtkFlowBox: A container that its children in a reflowing
  grid, which can be oriented horizontally or vertically.
  It is similar to GtkListBox in that the children can
  be sorted and filtered, and by requiring a dedicated child
  widget type, GtkFlowBoxChild. It is similar to GtkTreeView
  in that is supports a full set of selection modes, including
  rubberband selection.
* GtkStack: children can now indicate that they require
  attention by setting the needs-attention child property.
* Broadway now requires binary array buffers and modern WebSocket
  protocol support
* Autoscrolling in range widgets has been improved to work more
  reliably in maximized windows.
* GtkSpinner has been changed to render in in a limited set of
  sizes.
* GtkApplication now stores and handles accelerators for GActions
  itself.
* GtkIconTheme now falls back to the gnome icontheme to fix
  problems with the availability of symbolic icons in other
  icon themes.
* GTK+ respects the deprecated gtk-button-images and gtk-menu-images
  settings again.

For full details see:
https://git.gnome.org/browse/gtk+/tree/NEWS?id=3.12.2
Import waf-1.7.16 as devel/waf.

Waf is a Python-based framework for configuring, compiling and
installing applications. Here are perhaps the most important features
of Waf:

*   Automatic build order: the build order is computed from input
    and output files, among others
*   Automatic dependencies: tasks to execute are detected by hashing
    files and commands
*   Performance: tasks are executed in parallel automatically, the
    startup time is meant to be fast (separation between configuration
    and build)
*   Flexibility: new commands and tasks can be added very easily
    through subclassing, bottlenecks for specific builds can be
    eliminated through dynamic method replacement
*   Extensibility: though many programming languages and compilers
    are already supported by default, many others are available as
    extensions
*   IDE support: Eclipse, Visual Studio and Xcode project generators
    (waflib/extras/)
*   Documentation: the application is based on a robust model
    documented in The Waf book and in the API docs
*   Python compatibility: cPython 2.4 to 3.4, Jython 2.5, IronPython,
    and Pypy
+ waf.
Updated x11/gtk3 to 3.12.2
Import mpv-0.5.1 as multimedia/mpv.

mpv is a movie player based on MPlayer and mplayer2. It supports
a wide variety of video file formats, audio and video codecs, and
subtitle types.
+ mpv
Added multimedia/mpv version 0.5.1
Added devel/waf version 1.7.16
Insist on glib 2.40.0 for glibmm 2.40.0
While here, add to category gnome
Describe gtk3-atk-bridge.
buildlink3.mk should not set API depends. The package already
pulls in those versions if needed.
Allow '+' in another place checking for package names. Needed e.g. for gtk2+.

Bump version.
Updated pkgtools/pkglint to 4.146
Allow -std= in compiler flags.
Ride bump.
Add comments to patches.
Add basic infrastructure collecting information how to use waf.
Switch to using waf.mk.
Fix PLIST with lua option. From John D. Baker in PR 49183.
Add back BUILDLINK_API_DEPENDS.Xft2+= Xft2>=2.1.2nb2 for old
non-modular X.org.