Revert "Add libpq function PQhostaddr()."

Noah Misch <noah@leadboat.com>

Commit: 2cda889984a6f5ad405318f9e91202d258383b66
Author: Noah Misch <noah@leadboat.com>
Date: 2014-11-29T17:31:21Z
Releases: 9.5.0
Revert "Add libpq function PQhostaddr()."

This reverts commit 9f80f4835a55a1cbffcda5d23a617917f3286c14.  The
function returned the raw value of a connection parameter, a task served
by PQconninfo().  The next commit will reimplement the psql \conninfo
change that way.  Back-patch to 9.4, where that commit first appeared.

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