patch applied (ghc): improvement to the deadlock detection

[Simon Marlow]

Thu Feb  9 04:30:56 PST 2006  Simon Marlow <simonmar at microsoft.com>
  UNDO: improvement to the deadlock detection
  
  When the RTS is idle, as detected by the timer signal, instead of
  prodding capabilities from the signal handler (which is not guaranteed
  to work - pthread_cond_signal() can't be called from signal handlers),
  create a new thread to do it.

    M ./ghc/rts/Timer.c -22 +6