[xmonad] darcs patch: fix X.U.Run.spawnPipe fd leak

[Tomas Janousek]

Hello,

spawnPipe was leaking the read end of the pipe in the parent, causing xmonad to
pass all of those to every launched process.

This fixes it and I think it should go into the release, if it isn't too late.

Regards,

Sun Oct 25 22:02:46 CET 2009  Tomas Janousek <tomi at nomi.cz>
  * fix X.U.Run.spawnPipe fd leak

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