Enable Freetype, Webp and XPM support in GD
Summary:
Required by Pixelfed
Ref T1481
Test Plan:
Call the following functions:
- imagefttext()
- imagecreatefromxpm()
- imagewebp()
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T1481
Differential Revision: https://devcentral.nasqueron.org/D2019