title: Build protobufs only using Qt and tools shipped with it
body: <p>I'm developing Qt application on Win 7 (using Windows Qt distro with MinGW included) and I need to use Google's protocol buffers. So I followed this <a href="https://stackoverflow.com/questions/9243816/how-to-build-google-protocol-buffers-in-windows-for-mingw">How to build Google&#39;s protobuf in Windows using MinGW?</a> and I have managed to build it.</p>
  
  <p>But it was necessary for me to install separately MinGW and MSYS to achieve that.</p>
  
  <p>Is there <strong>cleaner</strong> way how to built in protobufs in my app just using Qt and it's toolchain ?</p>