databases/libzbxpgsql: Update to 1.1.0, Rename to databases/zabbix3-libzbxpgsql
Rename to allow multiple version of libzbxpgsql to coexist, each one
uses a different zabbix-agent version.
Add CONFLICTS in preparation for multiple versions as well.
PR: 221798
Submitted by: Martin Waschbusch <martin@waschbuesch.de> (maintainer)