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.

doc/src/sgml/libpq.sgml

@@ -1467,24 +1467,6 @@ char *PQhost(const PGconn *conn);
      </listitem>
     </varlistentry>
 
-    <varlistentry id="libpq-pqhostaddr">
-     <term>
-      <function>PQhostaddr</function>
-      <indexterm>
-       <primary>PQhostaddr</primary>
-      </indexterm>
-     </term>
-
-     <listitem>
-      <para>
-       Returns the server numeric IP address of the connection.
-<synopsis>
-char *PQhostaddr(const PGconn *conn);
-</synopsis>
-      </para>
-     </listitem>
-    </varlistentry>
-
     <varlistentry id="libpq-pqport">
      <term>
       <function>PQport</function>

src/bin/psql/command.c

@@ -302,7 +302,7 @@ exec_command(const char *cmd,
 	else if (strcmp(cmd, "conninfo") == 0)
 	{
 		char	   *db = PQdb(pset.db);
-		char	   *host = (PQhostaddr(pset.db) != NULL) ? PQhostaddr(pset.db) : PQhost(pset.db);
+		char	   *host = PQhost(pset.db);
 
 		if (db == NULL)
 			printf(_("You are currently not connected to a database.\n"));

src/interfaces/libpq/exports.txt

@@ -165,4 +165,3 @@ lo_lseek64                162
 lo_tell64                 163
 lo_truncate64             164
 PQconninfo                165
-PQhostaddr                166

src/interfaces/libpq/fe-connect.c

@@ -5339,14 +5339,6 @@ PQhost(const PGconn *conn)
 	}
 }
 
-char *
-PQhostaddr(const PGconn *conn)
-{
-	if (!conn)
-		return NULL;
-	return conn->pghostaddr;
-}
-
 char *
 PQport(const PGconn *conn)
 {

src/interfaces/libpq/libpq-fe.h

@@ -301,7 +301,6 @@ extern char *PQdb(const PGconn *conn);
 extern char *PQuser(const PGconn *conn);
 extern char *PQpass(const PGconn *conn);
 extern char *PQhost(const PGconn *conn);
-extern char *PQhostaddr(const PGconn *conn);
 extern char *PQport(const PGconn *conn);
 extern char *PQtty(const PGconn *conn);
 extern char *PQoptions(const PGconn *conn);