Windows packaging update

[Alexander Belchenko]

INADA Naoki пишет:
> I think it is nice to bundle some tools like wget, make, inno-setup,
> zlib, etc... to bzr-windows-installers.

Well, I have constant problem to download svn libs from tigris.org. But there is about 40MB of zip 
files. I'd like to have such big binary dependencies available in the subbranch (component) which 
can be obtained with bzr-externals/scmproj instead of putting them into main branch.

> 
> Downloading them during building fails sometime because of network
> trouble, server
> down, changing download link, etc...
>