Fixes from Bruce:

Serious:
- An important timevalfix() in settime[ofday]() was lost.

Not so serious:
- There was a race initializing `delta' in the check for setting the
  time backwards.
- The `#ifdef notyet' check for setting the time more than a day forwards
  was back to front.
[[I deleted the code, it's useless because of iteration - Peter]]
- The timespec was not checked for validity in clock_settime().
- The timespec was not fully checked for validity in nanotime().  The
  check in itimerfix() is too late, since the conversion from a timespec
  to a timeval may overflow.
- A garbage timeval was checked in settimeofday() for the (uap->tv == NULL
  && uap->tzp != NULL) case.  I added the broken check this some time ago.

Cosmetic:
- The "inadvertantly (sic) sleeping forever" test always failed.  hzto()
  always returns >= 1.
- The style wasn't very KNFish.  (I only changed new code.)

Submitted by: bde

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