Remove problematic SSL_DIRECTIVES line

nginx.conf.sigil

@@ -11,8 +11,6 @@ server {
   listen      [::]:443 ssl spdy;
   listen      443 ssl spdy;
   server_name $SSL_SERVER_NAME;
-$SSL_DIRECTIVES
-
   keepalive_timeout   70;
   add_header          Alternate-Protocol  443:npn-spdy/2;
   location    / {