[xmonad] bump X11 dependency

[wagnerdm at seas.upenn.edu]

As it says on Hackage[1], you can get the most recent X11 code from github[2].

~d

[1] http://hackage.haskell.org/package/X11
[2] https://github.com/haskell-pkg-janitors/X11

Quoting Jan-David Quesel <quesel at gmail.com>:

> Hey,
>
> where can I get X11 version 1.6.0? I do not find it anywhere on the web and
> the darcs repo http://darcs.haskell.org/X11 does not exist anymore.
>
> Jan
>
> On Fri, Mar 16, 2012 at 1:06 AM, <wagnerdm at seas.upenn.edu> wrote:
>
>> A corresponding patch just went into xmonad-contrib.
>>
>> Thu Mar 15 20:01:06 EDT 2012  Daniel Wagner <daniel at wagner-home.com>
>>  * bump X11 dependency
>>
>>  Strictly speaking, it probably isn't necessary to depend on a newer X11,
>> since
>>  xmonad still builds just fine with X11-1.5. However, xmonad-contrib does
>> *not*
>>  build fine with X11-1.5, and we would like to avoid the confusing
>> situation
>>  where someone successfully builds xmonad (with X11-1.5), then finds that
>>  building xmonad-contrib requires rebuilding xmonad from scratch (with a
>> newer
>>  X11).
>>
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>