Claim to be 1003.1-2001. We're not quite, yet, but that's a more useful

target than any pre-C99 POSIX (which we could never have conformed to
under our ia32 ABI).

Document why HOST_NAME_MAX (and hopefully other similar constants in the
future) is not defined.

Define in <sys/unistd.h> all 1003.1-2001 option and option group constants
which did not meet the standard for inclusion in <unistd.h>.  Delete from
<sys/unistd.h> all sysconf(3) constants and those option constants which
were moved to <unistd.h>.  pathconf(3) keys remain here as pathconf() is
implemented directly as a system call.  Add a comment noting brokenness
in some .1e additions here.  Fix whitespace in definition of constants for
rfork().

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