SSL: fixed incorrect usage of #if instead of #ifdef. In 2014ed60f17f, "#if SSL_CTRL_SET_ECDH_AUTO" test was incorrectly used instead of "#ifdef SSL_CTRL_SET_ECDH_AUTO". There is no practical difference, since SSL_CTRL_SET_ECDH_AUTO evaluates to a non-zero numeric value when defined, but anyway it's better to correctly test if the value is defined.

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


cat << END >> $NGX_AUTO_HEADERS_H

#ifndef $have
#define $have  1
#endif

END