Upgrade third-party modules: echo, headers_more and set_misc.

Dynamic modules support has been enabled for these third-party modules,
in case of usage of these modules please update nginx configuration
file for load these modules:

load_module "modules/ngx_http_echo_module.so";
load_module "modules/ngx_http_headers_more_filter_module.so";
load_module "modules/ngx_http_set_misc_module.so";

Do not bump PORTREVISION because these modules disabled by default.