Description:
------------
ftruncate returns false when the file being truncated is > 2GB and the offset is also > 2GB.
This only occurs on Windows and not on Linux/Mac

Test script:
---------------
<?php
$file_handle = fopen('test','cb');

if (false === $file_handle) {
    die('Cannot open test file :/');
}

$truncate_offset = 2 * 1024 * 1024 * 1024 + 1; // 2GB + 1
$ftruncate_result = ftruncate($file_handle, $truncate_offset);

if (false === $ftruncate_result) {
    die('Truncate has failed :/');
}

fclose($file_handle);