Fractional sleep

[Loïc Grenié]

    This patch adds a conditional feature to sleep to enable
  fractional arguments to sleep (not to fancy sleep though).
  Cost is: 118 bytes for code + 2*23 for help.

     Another thing: both coreutil/{u,}sleep.c are NOFORK and
  call bb_perror_nosmg_and_die(); is it correct ?

     Loïc Grenié
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