Description:
------------
When some functions/variables are imported into FFI object, it would be nice to provide this information via declared properties/methods information. 


Test script:
---------------
<?php
// create FFI object, loading libc and exporting function printf()
$ffi = FFI::cdef("
    int printf(const char *format, ...);
    int errno;", 
    "libc.so.6");

// Would be nice to have report about imported properties and methods, also in introspection
var_dump($ffi, get_object_vars($ffi), get_class_methods($ffi));

Expected result:
----------------
Information about existing properties and existing methods. Maybe even with ability to reflect them via Reflection, eg. extract a closure instance.

Actual result:
--------------
There is no information about imported variables and functions.