[Bug-wget] no_proxy env ip address range support

[Aníbal Limón]

Hi guys,

I noticed that wget only support domain names entries into no_proxy 
env-var, i think will be good to
add support for IPs and IP ranges.

I reviewed the code and i think can be added to 
src/retr.c:no_proxy_match , that will be resolv
the host to IP if the no_proxy variable contains an IP and then validate 
if match.

It would be a change that could add?, Comments?

Cheers,
    alimon