Update PHP compatibility information.

Summary: Ref T5141. Generated using PHP v5.5.12 and PHP_CompatInfo v2.26.0.

Test Plan: N/A

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5141

Differential Revision: https://secure.phabricator.com/D9236