Support gmtoff and zone in time formatting.

The glibc strftime function can refer to the character
string zone, and numeric zone via %Z and %z. So
let us populate these from the Lisp structure.

* time.c (time_fields_to_tm): Take gmtoff and zone
arguments. Store these values in the struct tm,
suitably converted, instead of zeros and nulls.
In the case of zone, we dynamically allocate a utf-8
string, which will have to be freed.
(time_fields_cleanup): New static function.
Called to clean up any allocations performed by
time_fields_to_tm.
(time_struct_to_tm): Drop the strict parameter.
This is useless because the underlying function
time_fields_to_tm checks for nils and substitutes
zeros. This silliness was introduced in a commit
made in 2016.  Extract the gmtoff and zone, passing
these to time_fields_to_tm.
(make_time_impl): Pass nil for gmtoff and zone,
call time_fields_cleanup.
(time_string_meth, time_parse_meth): No need to pass
strict parameter to time_struct_to_tm. Need to call
time_fields_cleanup.

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