This is an alternate AF_ALG engine for openssl, based on the devcrypto
engine, but using the AF_ALG interface instead of /dev/crypto.

It is different than the AF_ALG engine that ships with OpenSSL:
  - it uses sync calls, instead of async
  - it suports more algorithms

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>