Delete function krb5_get_init_creds_opt_init

spnego-http-auth-nginx-module-master/ngx_http_auth_spnego_module.c:576:5: error: 'krb5_get_init_creds_opt_init' is deprecated [-Werror,-Wdeprecated-declarations]
    krb5_get_init_creds_opt_init(&gic_options);