Description:
------------
The return results for imagettfbbox are way off. The function gives a large negative values for [1] (lower left corner, Y position), [2] (lower right corner, X position), [4](upper right corner, X position), [7](upper left corner, Y position).

The changelog shows a solved bug regarding this function (#48555), perhaps it is related.

The font can be downloaded here: http://www.fonts4free.net/dsplus/m.php?p=bn_machine.zip

Reproduce code:
---------------
<?php
print_r(imagettfbbox(37, 11, '/var/www/fonts/BNMachine.ttf', 'T'));
?>

Expected result:
----------------
Result from PHP 5.2.10:

Array
(
    [0] => -1
    [1] => 0
    [2] => 25
    [3] => -4
    [4] => 18
    [5] => -42
    [6] => -9
    [7] => -37
)

Actual result:
--------------
Result from PHP 5.2.11:

Array
(
    [0] => -1
    [1] => -2147483648
    [2] => -2147483648
    [3] => -4
    [4] => -2147483648
    [5] => -42
    [6] => -9
    [7] => -2147483648
)