download giflib from launchpad.net
download giflib from launchpad.net

Summary: Sourceforge is super unreliable and our CircleCI build is failing because it can't download giflib from there. Switch to downloading from launchpad.net (bonus: HTTPS).

Reviewed By: kirwan

Differential Revision: D4414782

fbshipit-source-id: 42dd0daf4b4588963fbc3edc0622f5af90406669

xjy2061/NovaImageLoader,facebook/fresco,MaTriXy/fresco,xjy2061/NovaImageLoader,desmond1121/fresco,MaTriXy/fresco,xjy2061/NovaImageLoader,facebook/fresco,MaTriXy/fresco,xjy2061/NovaImageLoader,desmond1121/fresco,facebook/fresco,desmond1121/fresco,xjy2061/NovaImageLoader,MaTriXy/fresco,s1rius/fresco,facebook/fresco,facebook/fresco,facebook/fresco,desmond1121/fresco,desmond1121/fresco,s1rius/fresco,MaTriXy/fresco,s1rius/fresco,s1rius/fresco