Description:
------------
It seems the `php-gd` module which enables using `imagefilledarc` method cannot render in some degrees corecctly.

* versions (format: `distro: version`) tested the issue on:
  * ubuntu-bionic: 7.2.10-0ubuntu0.18.04.1
  * archlinux: 7.3.1

* for reproduction install `php-gd` and allow `extension=gd` in your php.ini

Test script:
---------------
<?php

$image  = imagecreatetruecolor(100, 100);
$red    = imagecolorallocate($image, 200,   0,   0);
$white  = imagecolorallocate($image, 255, 255, 255);

imagefill($image, 0, 0, $white);

imagefilledarc($image, 50, 50, 100, 50, 91, 360, $red, IMG_ARC_PIE);

header('Content-type: image/png');
imagepng($image, phpversion() . '.png');


Expected result:
----------------
The rendered ellipse fill should start just one degree after the 6 hour-o-clock position.

Actual result:
--------------
The rendered ellipse fill starts much more after the 6-hour-o-clock position.