SSL: detect "listen ... ssl" without certificates (ticket #178). In mail and stream modules, no certificate provided is a fatal condition, much like with the "ssl" and "starttls" directives. In http, "listen ... ssl" can be used in a non-default server without certificates as long as there is a certificate in the default one, so missing certificate is only fatal for default servers.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  0
#endif

END