wangel/ssl: fix build when `FOLLY_OPENSSL_IS_110` is set
wangel/ssl: fix build when `FOLLY_OPENSSL_IS_110` is set

Summary:
A code block gating on `FOLLY_OPENSSL_IS_110` uses `folly::fibers::onFiber()`,
so make sure we add the appropriate header/dep for this to build.

Reviewed By: pixelb

Differential Revision: D14632272

fbshipit-source-id: 58fd7372bf06dfdd415c1e4379fa974704170d08

facebook/wangle,facebook/wangle,facebook/wangle