tweak the sql_like_expression feature a little bit to allow correct escaping

git-svn-id: file:///svn/phpbb/trunk@7789 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/includes/db/firebird.php

@@ -408,6 +408,15 @@ class dbal_firebird extends dbal
 		return str_replace("'", "''", $msg);
 	}
 
+	/**
+	* Build LIKE expression
+	* @access private
+	*/
+	function _sql_like_expression($expression)
+	{
+		return $expression;
+	}
+
 	/**
 	* Build db-specific query data
 	* @access private