Remove FOLLY_DEPRECATED entirely
Remove FOLLY_DEPRECATED entirely

Summary: Actually remove it. All uses of it (outside of thrift) were removed in the previous diff.

Reviewed By: ot

Differential Revision: D7422614

fbshipit-source-id: 6a59c34b3cbc0ee7c50f8cbf8c5e641352f2db1a

rklabs/folly,rklabs/folly,facebook/folly,facebook/folly,rklabs/folly,facebook/folly,rklabs/folly,rklabs/folly,facebook/folly,facebook/folly