src/lib/Libutil/pbs_ical.c no longer builds with newer versions of libical

Building PBS Pro with libical version 3.0.3 produces the following compile error:

The function icaltime_from_timet() had been deprecated for a while and has been removed now. The recommended fix is to replace all occurrences of
icaltime_from_timet(..., ...) with icaltime_from_timet_with_zone(..., ..., NULL).

Affected Platforms:
openSUSE Tumbleweed, openSUSE Factory