[Xmonad] darcs patch: Add ClientMessageEvent support

[Spencer Janssen]

On Thursday 11 October 2007 17:52:15 mail at joachim-breitner.de wrote:
> Thu Oct 11 23:48:12 CEST 2007  mail at joachim-breitner.de
>   * Add ClientMessageEvent support
>   This is needed for example for EMWH interaction, maybe more.
>
>   Please review this for bad use of ffi – I don’t have much experience
> here.
>
>   Thanks,
>   Joachim

Seems okay.  Applied.