SSI: return NGX_ERROR when timefmt memory allocation failed. Previously, when using NGX_HTTP_SSI_ERROR, error was ignored in ssi processing, thus timefmt could be accessed later in ngx_http_ssi_date_gmt_local_variable() as part of "set" handler, or NULL format pointer could be passed to strftime().

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


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  0
#endif

END