mshtml(2/2): Support getting the proxy settings from the environment

[Jacek Caban]

Hi Juan,

Your patch looks good (although I'd suggest splitting set_proxy to two 
function instead of doing it by gotos), but I've just sent a patch that 
makes mshtml use wininet for networking (via urlmon), so your patch is 
no longer needed. My patch is a major step forward in MSHTML/shdocvw 
implementation, but it's very risky, so I will not immediately remove 
set_proxy from the tree and wait for things to stabilize, but I don't 
think we want to extend it.

Thanks,
    Jacek