Install curl PHP extension on Eglide

Summary:
Arcanist complains php-curl is missing. We so explicitely require it.

Fixes T1181.

Test Plan: arc

Reviewers: jokerozen, dereckson

Reviewed By: dereckson

Subscribers: Sandlayth

Maniphest Tasks: T1181

Differential Revision: https://devcentral.nasqueron.org/D951