[PATCH 0 of 2] SSL: let it build against BorginSSL and LibreSSL (take #3)

[Piotr Sikora]

Hey Maxim,
just to speed this up, this is the version without any #ifndefs
around SSL_CTX_set_tmp_rsa_callback().

Feel free to commit whichever version you prefer.

Best regards,
Piotr Sikora