Update from 1.19.5 to 1.19.6.
<Changelog>
*) Bugfix: "no live upstreams" errors if a "server" inside "upstream"
block was marked as "down".
*) Bugfix: a segmentation fault might occur in a worker process if HTTPS
was used; the bug had appeared in 1.19.5.
*) Bugfix: nginx returned the 400 response on requests like
"GET http://example.com?args HTTP/1.0".
*) Bugfix: in the ngx_http_flv_module and ngx_http_mp4_module.
Thanks to Chris Newton.
</Changelog>