[tz] winnow patches

[Alan Barrett]

On Sat, 07 Sep 2013, Bennett Todd wrote:
> Does this tool really need to be portable to busybox, or other 
> such spare environment?

No, but I think that it is desirable for it to be portable to most 
POSIX systems.  Zefram seems willing to remove any gawkisms that 
have crept into his patches, so I don't see a problem.

The shell portion of the code already relies on the select 
statement, which is in bash and in ksh, but not in POSIX sh, and 
I think that's fine -- most systems have at least one of ksh or 
bash.  The awk part of the code used to be portable, and should 
soon be portable again.

--apb (Alan Barrett)