[tz] localtime.c patch

[Paul Eggert]

On 10/08/2014 06:20 AM, Christos Zoulas wrote:
> I prefer not to return random bits from the heap to the user.

On my platform a timezone_t struct has 25488 bytes, and clearing them 
all would take a bit of time.  Since the user can look at the heap 
anyway, clearing the bits wouldn't add security.

> There were other NetBSD changes that were
> not carried forward, and perhaps they should

Thanks, the attached proposed patch should address those issues. I've 
left the issue of documenting return and errno values for another day.
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