darcs patch: Fix unportable use of sleep(1)

[Matthias Kilian]

Sat Aug 29 11:37:20 CEST 2009  Matthias Kilian <kili at outback.escape.de>
  * Fix unportable use of sleep(1)
  `sleep 1s' is probably a GNUism; `sleep 1' should do the same in a
  portable way.
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