Limit req: use complex value in limit_req_zone. One intentional side effect of this change is that key is allowed only in the first position. Previously, it was possible to specify the key variable at any position, but that was never documented, and is contrary with nginx configuration practice for positional parameters.

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


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  1
#endif

END