[FreeNX-kNX] nxnode: curl should bypass a proxy

[Fabian Franz]

> Hi Fabian,

Hi,

> 
> if there's a proxy set (environment variable) on the remote side, the
> download of ppd files fails. To work around this problem, curl can be 
> invoked with param --proxy "", diff attached.

Thanks.

Commited to SVN.

cu

Fabian