Add more SSL_CIPHER_* functions, necessary to implement ctx.get_ciphers() in PyPy (#4364)

* Add more SSL_CIPHER_* functions, necessary to implement ctx.get_ciphers() added by Python 3.6.1.

* Add placeholders for other versions

* Remove parameter names

* LibreSSL 2.7 has the new functions

* Add entries in _conditional.py

* SSL_CIPHER_get_id returns int, not char*
2 files changed