* time/tzset.c (tzset_internal): If TZ is not set do not compare
old and new tz value since it might be /etc/localtime in both
cases although the file changed. [BZ #154]
Patch by Christian Franke <franke@computer.org>.
* time/tzfile.c (__tzfile_read): Determine dev/ino of file.
Compare with values of previously opened file. Don't do anything
is they match.