cmake and source changes for desurium windows build

this pull request add all stuff needed to build desurium on windows systems

There are still some issues left with the CEF build:
* The DirectX9 include path has to be added manually, but we check already for the DirectX SDK
* one perl script is aborting with some internel windows error (while opening shared libraries or something), adding a "select(undef, undef, undef, 0.2)" before the call helped for me.

Except of this issues, desurium seems to run just fine. I've tested installing/running games, browser through the store and view flash videos. H.264 won't work with the chromium 15 code base, because it does not support building ffmpeg and we can only download ffmpeg dlls without prop. codec support.

this pull request fixes #106 and fixes #583. It also fixes #329 for windows, it was already for Linux.