patch applied (ghc-6.6/packages/unix): don' t retry usleep() on EINTR (see #850/#1156)

[Simon Marlow]

Fri Mar  2 03:41:18 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * don't retry usleep() on EINTR (see #850/#1156)

    M ./System/Posix/Unistd.hsc -1 +1