Log message:
Add x11/{,lua-,py-}keybinder version 0.3.0

The Keybinder package contains a library for registering global keyboard
shortcuts.
Keybinder works with GTK-based applications using the X Window System.

The library contains:
- A C library, libkeybinder
- Python bindings, python-keybinder
- An examples directory with programs in C, Lua, Python and Vala.

There are: Python (py-keybinder) and Lua (lua-keybinder) bindings.

Approved by <riastradh>

Nobody complains to import it since 2015-04-08
http://mail-index.netbsd.org/tech-pkg/2015/04/07/msg014589.html

Originally packaged in pkgsrc-wip by myself.