[WIN32] download and compile ffmpeg from remote source.
[WIN32] make XBMC compile, build and run with the ffmpeg link libraries.
[WIN32] use ffmpeg version from tools\depends\target\ffmpeg\FFMPEG-VERSION
[WIN32] prepare mingw build files for jenkins.
[WIN32] removed old mingw build files.
Merge pull request #216 from wsoltys/ffmpeg2

[WIN32] compile, build and run XBMC by using the ffmpeg import libraries