Merge proxy_protocol setting of listen directives. It's now enough to specify proxy_protocol option in one listen directive to enable it in all servers listening on the same address/port. Previously, the setting from the first directive was always used.

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


have=NGX_SUPPRESS_WARN . auto/have

have=NGX_SMP . auto/have