Description:
------------
Following construction with "const" and double pointer modifier could not be parsed by FFI:

    typedef struct _simple_struct {
        const some_not_declared_type **property;
    } simple_struct;

Test script:
---------------
<?php
$ffi = FFI::cdef("
    typedef struct _simple_struct {
        const some_not_declared_type **property;
    } simple_struct;
");

Expected result:
----------------
Fatal error: Uncaught FFI\ParserException: undefined C type 'some_not_declared_type'

Actual result:
--------------
Fatal error: Uncaught FFI\ParserException: unexpected '*' at line