Upstream: hide_headers_hash handling at http level. When headers to hide are set at the "http" level and not redefined in a server block, we now preserve compiled headers hash into the "http" section configuration to inherit this hash to all servers.

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


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  1
#endif

END