BUILD: ssl: Build with new cryptographic library AWS-LC

BUILD: ssl: Build with new cryptographic library AWS-LC

This adds a new option for the Makefile USE_OPENSSL_AWSLC, and
update the documentation with instructions to use HAProxy with
AWS-LC.

Update the type of the OCSP callback retrieved with
SSL_CTX_get_tlsext_status_cb with the actual type for
libcrypto versions greater than 1.0.2. This doesn't affect
OpenSSL which casts the callback to void* in SSL_CTX_ctrl.