Allow Folly to determine SNI support
Allow Folly to determine SNI support

Summary:
Folly defines the macro FOLLY_OPENSSL_HAS_SNI to detect this feature.
Closes https://github.com/facebook/wangle/pull/89

Reviewed By: yfeldblum

Differential Revision: D4702465

Pulled By: anirudhvr

fbshipit-source-id: 1b6113ea923fcdfe557a8c8c553fe0c9b9b5d44f

facebook/wangle,facebook/wangle,facebook/wangle