Include PostgreSQL when checking for available database drivers.

Signed-off-by: Brice Maron <brice@bmaron.net>

lib/util.php

@@ -175,8 +175,8 @@ class OC_Util {
 		$errors=array();
 
 		//check for database drivers
-		if(!is_callable('sqlite_open') and !is_callable('mysql_connect')){
-			$errors[]=array('error'=>'No database drivers (sqlite or mysql) installed.<br/>','hint'=>'');//TODO: sane hint
+		if(!is_callable('sqlite_open') and !is_callable('mysql_connect') and !is_callable('pg_connect')){
+			$errors[]=array('error'=>'No database drivers (sqlite, mysql, or postgresql) installed.<br/>','hint'=>'');//TODO: sane hint
 		}
 		$CONFIG_DBTYPE = OC_Config::getValue( "dbtype", "sqlite" );
 		$CONFIG_DBNAME = OC_Config::getValue( "dbname", "owncloud" );