pgsql: Revert "Add libpq function PQhostaddr()."

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.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/2cda889984a6f5ad405318f9e91202d258383b66

Modified Files
--------------
doc/src/sgml/libpq.sgml           |   18 ------------------
src/bin/psql/command.c            |    2 +-
src/interfaces/libpq/exports.txt  |    1 -
src/interfaces/libpq/fe-connect.c |    8 --------
src/interfaces/libpq/libpq-fe.h   |    1 -
5 files changed, 1 insertion(+), 29 deletions(-)