Fix compatibility with OpenSSL 1.1
Fix compatibility with OpenSSL 1.1

OpenSSL 1.1 removed the deprecated HMAC_CTX_init() and
HMAC_CTX_cleanup() and declared the HMAC_CTX struct private.

However, as far as I can see HMAC_CTX isn't used at all here,
so the problematic code can simply be removed

darrenjs/wampcc,darrenjs/wampcc,darrenjs/wampcc,darrenjs/wampcc,darrenjs/wampcc