[Patch] BZ#14080: Fix daylight time change for the US

[Roland McGrath]

> I found in 1003.1-2003 regarding tzset "If TZ is absent from the 
> environment, implementation-dependent default time zone information is 
> used. ". So, we could also use something completely different ;). I 
> guess nobody uses this, so let's stick with my patch.

That is a different case, where we already use the table-driven
/etc/localtime setting.  Here we are talking about a setting like
"TZ=EST5EDT", where POSIX specifies the meaning of the three fields
that were given and is (now) ambiguous about the omitted ones.


Thanks,
Roland