Update third-party spnego-http-auth module

Add the corresponding library path to the patch for the
third-party http_auth_spnego module.

The third-party http_auth_spnego module may not work with
in-base Kerberos implementation because of gss_locaname()
function usage, so remove the GSSAPI_BASE option from the
GSSAPI radio button. (merge from www/nginx-devel in r546696)

Sponsored by: Netzkommune GmbH