databases/pgpool-II-35: Update from 3.5.18 to 3.5.19

Changelog:

• Test: Fix old JDBC functions and typos in regression test 068.memqcache_bug.
• Doc: Fix configuration change timing regarding memory_cache_enabled.
• Fix online recovery failed due to client_idle_limit_in_recovery in certain cases. (bug 431)
• Fix corner case bug when strip_quote() handle a empty query string. (bug 458)
• Fix Pgpool child segfault if failover occurs when trying to establish a connection.
• Fix Pgpool-II hang if a client sends a extended query message such as close after sync message but before next simple query.
• Fix Pgpool-II hang when idle_in_transaction_session_timeout = on. (bug 448)

Changelog taken from: http://www.pgpool.net/docs/latest/en/html/release-3-5-19.html

MFH: 2019Q1