nginx: add http_realip_module support

The ngx_http_realip_module module is used to change the client address and optional port to the one sent in the specified header fields.

component/nginx/buildout.cfg

@@ -21,6 +21,7 @@ configure-options=
   --with-http_ssl_module
   --with-http_v2_module
   --with-http_gzip_static_module
+  --with-http_realip_module
   --with-mail
   --with-mail_ssl_module
   --with-ld-opt="-L ${openssl:location}/lib -L ${pcre:location}/lib -L ${zlib:location}/lib -Wl,-rpath=${openssl:location}/lib -Wl,-rpath=${pcre:location}/lib -Wl,-rpath=${zlib:location}/lib"