Upstream: optimized use of SSL contexts (ticket #1234). To ensure optimal use of memory, SSL contexts for proxying are now inherited from previous levels as long as relevant proxy_ssl_* directives are not redefined. Further, when no proxy_ssl_* directives are redefined in a server block, we now preserve plcf->upstream.ssl in the "http" section configuration to inherit it to all servers. Similar changes made in uwsgi, grpc, and stream proxy.

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


ngx_include="unistd.h";      . auto/include
ngx_include="inttypes.h";    . auto/include
ngx_include="limits.h";      . auto/include
ngx_include="sys/filio.h";   . auto/include
ngx_include="sys/param.h";   . auto/include
ngx_include="sys/mount.h";   . auto/include
ngx_include="sys/statvfs.h"; . auto/include
ngx_include="crypt.h";       . auto/include