Get real dbms version instead of relying on php internal functions which only grab the local library version

git-svn-id: file:///svn/phpbb/trunk@8821 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/includes/db/dbal.php

@@ -74,6 +74,11 @@ class dbal
 	var $any_char;
 	var $one_char;
 
+	/**
+	* Exact version of the DBAL, directly queried
+	*/
+	var $sql_server_version = false;
+
 	/**
 	* Constructor
 	*/