[PATCH 2 of 2] SSL: let it build against BoringSSL

[Piotr Sikora]

Hey Maxim,

> I'm rather committed to switching to BoringSSL myself in the near
> future, so this is more than just "it compiles" change.

btw: BoringSSL is using CMake so "--with-openssl" obviously doesn't
work, but if you're interested in adding "--with-boringssl" then I'd
be more than happy to provide it.

Best regards,
Piotr Sikora