databases/pgpool: Update from 3.4.3 to 3.4.9

Changelog: http://www.pgpool.net/docs/pgpool-II-3.4.8/NEWS.txt
Changelog: http://www.pgpool.net/docs/latest/en/html/release-3-4-9.html

PR: 206839
Submitted by: Felix Hanley <felix@userspace.com.au>