Add compatibility with OpenSSL 1.1.0
Add compatibility with OpenSSL 1.1.0

In their continued wisdom OpenSSL developers keep breaking APIs left and
right with very poor documentation and forward/backward source compatibility.

Signed-off-by: Simo Sorce <65f99581a93cf30dafc32b5c178edc6b0294a07f@redhat.com>
Closes #96
Closes #97

frenche/mod_auth_gssapi,frenche/mod_auth_gssapi,frenche/mod_auth_gssapi,frenche/mod_auth_gssapi