[PATCH] Ignore response header entries with zero hash in ngx_http_varaible_headers

[agentzh]

Hello!

I've noticed that the ngx_http_variable_headers function in the nginx
core does not ignore (response) header entries with zero "hash" field,
which may result in incorrect values of nginx variables like
$sent_http_cache_control and the attached patch for nginx 1.1.4
(hopefully) fixes this issue.

Thanks!
-agentzh
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