[tz] localtime.c patch

[random832 at fastmail.us]

On Tue, Oct 7, 2014, at 16:48, Arthur David Olson wrote:
> Back in the 1980s (when this code had its origins), NULL pointers weren't
> guaranteed to be all zeroes; having a static, otherwise unused structure
> (which was guaranteed to be initialized correctly) for initialization
> purposes was cheap portability insurance. (The insurance was taken out
> consistently, both for uniformity and to avoid problems if a pointer was
> added to a structure later.) Given updates to the C standard and waning
> interest in supporting old systems, this insurance may well no longer be
> needed.

Just to be clear, the updates to the C standard regarding this issue
consist of allowing one to initialize a non-static structure with the
literal "{0}", rather than anything about being able to memset pointers
or floats.