Added support for gzip flag, as it is in ngx_http_memcached_module

[antonbormotov]

[bpaquet]

If I understand, this code add a header on output is a flag is set in the config. Correct ?

[antonbormotov]

@bpaquet, that is the idea, but incorrect implementation, I'm working on it.

[bpaquet]

The best way to do that is to use custom http headers. There is no need to modify the C code.

[antonbormotov]

Yes, It can be done in this way, but I wanted to add support for directive enhanced_memcached_gzip_flag in the same way it is done in embedded nginx module ngx_http_memcached_module.