Capture maximum version information in php_compat_info.

Summary: Ref T5141. In order to be able to warn when deprecated functions are used, we need to be aware of from which version the functions were deprecated.

Test Plan: Ran arc lint and made sure no unexpected warnings were raised.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5141

Differential Revision: https://secure.phabricator.com/D9248