adodb: check for Postgres 8.1

See Eduforge #2318 or LP #547951.

(cherry picked from commit 4bdafccb)

Change-Id: I760074378fe3a447f9e0e819af1afd136df1f8a0
Signed-off-by: Cecilia Vela Gurovic <ceciliavg@catalyst.net.nz>

htdocs/lib/adodb/drivers/adodb-postgres64.inc.php

@@ -131,11 +131,8 @@ class ADODB_postgres64 extends ADOConnection{
 
 	function ServerInfo()
 	{
-		if (isset($this->version)) return $this->version;
-
 		$arr['description'] = $this->GetOne("select version()");
 		$arr['version'] = ADOConnection::_findvers($arr['description']);
-		$this->version = $arr;
 		return $arr;
 	}