Quickfix for .zip file generation for deploy

Dammit. After major launch, found significant enough bug that needs fixing:

 1) windows version had gameapi_deploy.zip -file generation broken. It used tar.exe from windows to generate
     a zip file, but apparently tar.exe is unable to create a zip file even though it can decode one. When trying to generate
     zip, it happily generated a tar package instead, and tools expecting .zip extension to match real zip files, consider the file
     corrupted. => working solution uses powershell magic in windows to generate a .zip file.