Add PEM_write_bio_DHxparams, d2i_DHxparams_bio, i2d_DHxparams_bio (#3485)
* Add PEM_write_bio_DHxparams
* Define PEM_write_bio_DHxparams only if EVP_PKEY_DHX defined.
Both added in commit afb14cda in openssl
* Add d2i_DHxparams_bio and i2d_DHxparams_bio bindings
* Fix bindings addition
* change condtional bindings to be after 1.1.0f
* Change i2d_DHxparams_bio return type
* define Cryptography_d2i_DHxparams_bio and Cryptography_i2d_DHxparams_bio
* Remove d2i_DHxparams_bio, i2d_DHxparams_bio bindings
* Add declarations for Cryptography_d2i_DHxparams_bio and Cryptography_i2d_DHxparams_bio
* Move Cryptography_d2i_DHxparams_bio and Cryptography_i2d_DHxparams_bio declaration to MACROS
* Add Cryptography_d2i_DHxparams_bio, Cryptography_i2d_DHxparams_bio and PEM_write_bio_DHxparams to _coditionals.py
* Make sure we did not define EVP_PKEY_DHX
3 files changed