wget darwin: disable Test-iri-disabled.px

This test fails on MacOS X. The failure has something to do with
the tests expecting filesystems to accept/store filenames as
bytes. On the HFS+ filesystem, however, filenames are Unicode
characters (Normalisation Form D).

This wget ticket appears to be relevant
    http://savannah.gnu.org/bugs/index.php?27541

The maintainer does not seem to think that this test
failure represents a problem in practice:
    http://article.gmane.org/gmane.comp.web.wget.general/8988

But this patch should be revisited/removed if this aspect of wget is
ever addressed in the future.

NB: I'm also a bit concerned/confused that none of the tests mentioned
in that message seem to fail, so I'm not 100% sure if this is the
relevant issue.
sdlmame: update to latest version
mpd: update to latest version
yandex-disk: add the Yandex.Disk cloud storage client

Details:
http://help.yandex.com/disk/cli-clients.xml
xfce4-xkb-plugin: Add package

Allows you to setup and use multiple keyboard layouts.
xfce4-datetime-plugin: Add package

Shows the date and time in the panel, and a calendar appears when you left-click on it.
xfce4-session: Don't set $PATH in xflock4 script

This makes Xfce4's "Lock Screen" action button actually work when xscreensaver
is installed and the daemon is running.
hibernate: upgrade from 1.98.1 to 2.0
openbox: Update to 3.5.2
haskellPackages.digits: New expression
Add a nix module for AMD Hybrid Graphics
ttmkfdir: update URL (close #1244)
linux: Update to 3.11.8 (close #1243)
Merge pull request #1251 from wkennington/amd

Add a nix module for AMD Hybrid Graphics
texlive: update to latest version
Upgrade Django Versions

This patch pushes django 1.4.1 -> 1.4.10 and adds django 1.5.5 and
django 1.6. Additionally, it creates the default django package which
always points to the latest version.
Merge pull request #1258 from wkennington/django

Upgrade Django Versions
Merge pull request #1254 from lovek323/texlive

texlive: update to latest version
Merge pull request #1245 from nathanielbaxter/dev/openbox

openbox: Update to 3.5.2
Merge pull request #1239 from grwlf/yandex-disk

yandex-disk: add the Yandex.Disk cloud storage client