* Added -Wstrict-prototypes flag and fixed resulting errors.
* Removed double underscores from header guards.
* Changed EVP_MD_CTX_create to EVP_MD_CTX_new and EVP_MD_CTX_destroy to EVP_MD_CTX_free.
* Fixed comments.
* Changed Kyber function signatures.
* Revert "Changed EVP_MD_CTX_create to EVP_MD_CTX_new and EVP_MD_CTX_destroy to EVP_MD_CTX_free."
This reverts commit f09b5e49d73b16b56d332fbcfc3b671966032fd4.