Fix FireBreath cmake to compile with Visual Studio Express 2012

The FireBreath project provides a framework to create multiplatform browser plugins. When building a plugin in Windows, it supports the Visual Studio Express editions by adding the Windows DDK but this has been tested and documented only for Windows 7, Visual C++ Express 2010 and the Windows 7 DDK. I need to update the cmake or other related files so I can compile a FireBreath plugin in Windows 8 using Visual Studio Express for Desktop and if needed the Windows SDK or DDK version 8. I am not an expert in cmake but I believe the problem is related to installation directories as the Windows 8 DDK installs ATL and MFC libraries in different directories under Program Files (x86)/Windows Kits/8.0 The deliverables I need are the updated files that would work in a computer with Visual Studio Express for Desktop and if needed the Windows 8 SDK or DDK in the default installation directories. Ideally, if you create a fork of the FireBreath project at [login to view URL] and send a pull request for the modifications that would be the best. If you have questions, don't hesitate to ask them by mail.