[PATCH] SSL: let it build against LibreSSL

[Piotr Sikora]

Hey Maxim,

> Alternatively, we may consider rewriting tests to avoid checking
> OPENSSL_VERSION_NUMBER and/or do configure time tests instead.

Yeah, that's much better approach, although I don't think we can avoid
it completely.

Also, most of the existing checks can be removed once support for
OpenSSL-0.9.7 is dropped...

Best regards,
Piotr Sikora