find(1) mishandles multiple -newer options - fix included

[Mark Plotnick]

> From jpl at allegra.UUCP (John P. Linderman)
> The following diffs to the BSD 4.2 source correct the problem,
> and add a dozen options.  (Only a few options are genuinely
> useful, but it was cleaner to add them all than to prune out
> the useless ones.)
Look out, world!  I was just showing Linderman a bug in "ls" this morning...