Prevent rsyslogd from writing log messages about TZ being unset in the
environment.
This is a putely cosmetic change, as the default behaviour according
to tzset(3) is:
If TZ does not appear in the environment, the best available approximation to local wall clock time, as specified by the tzfile(5)-format file /etc/localtime is used.
Slightly modified from the patch supplied by zi to use the rc.subr(8)
'${name}_env' variable.
PR: 248185
Submitted by: zi