Partially revert dropping redundant OpenSSL declarations
Partially revert dropping redundant OpenSSL declarations

This partially reverts commit f8b62dc13877b988e2421c5a4be7893e1e2d9657,
as the WebSocket tests currently fail on Buildkite (OpenSSL 1.0.2).

gedaiu/vibe.d,Geod24/vibe.d