add cross compiling docs
since apparently nobody on #tor-dev knows, I wrote a document.
https://cgit.alxu.ca/tor.git/commit/?h=building-tor-mingw-docs
setting catalyst as reviewer since they say they tried it and it works.
since apparently nobody on #tor-dev knows, I wrote a document.
https://cgit.alxu.ca/tor.git/commit/?h=building-tor-mingw-docs
setting catalyst as reviewer since they say they tried it and it works.