Description:
------------
__callStatic is not invoked when called method is defined as private or protected.

Reproduce code:
---------------
class Test
{
    private static function foo()
    {
    }

    public static function __callStatic($name, $args)
    {
        var_dump($name);
    }
}

Test::foo();

Expected result:
----------------
string(3) "foo" 

Actual result:
--------------
Fatal error: Call to private method Test::foo() from context '' in %s on line %i