Description:
------------
The sizeof off_t is determined via the C macro SIZEOF_OFF_T which
is not defined.  This causes wrong handling of off_t values on
some architectures, e.g. x86.

This issue has been found by girgias@php.net.


Test script:
---------------
// C code

void fill_array(off_t *array, size_t elems)
{
	int i;
	for (i = 0; i < elems; i++) {
		array[i] = i;
	}
}


<?php
$ffi = FFI::cdef('void fill_array(off_t *array, size_t elems);');
$array = FFI::new("off_t[3]");
$ffi->fill_array($array, 3);
var_dump($array);
?>


Expected result:
----------------
object(FFI\CData:int64_t[3])#2 (3) {
  [0]=>
  int(0)
  [1]=>
  int(1)
  [2]=>
  int(2)
}


Actual result:
--------------
object(FFI\CData:int32_t[3])#2 (3) {
  [0]=>
  int(0)
  [1]=>
  int(1)
  [2]=>
  int(2)
}