* time/tzfile.c (__tzfile_read): Read POSIX TZ string if available
even when time_t is 32-bit.
(__tzfile_compute): Override POSIX TZ string STD/DST zone names if
timezone data read by __tzfile_default. Ensure __tzname[0] is
always set after the search.
* time/tzfile.c (__tzfile_compute): For use_last case set i to
num_transition rather than num_transitions - 1.