Corrected linking error in MSVC 2010 build

- raw_encoder.cpp and raw_decoder.cpp where missing in Visual Studio 2010 project
VS2010: adding another pre-build command to copy platform.hpp in perf/ directory
VS2008 & VS2010: adding the pre-build command to copy platform.hpp in perf/ directory to the two appropriate projects, for each MSVC version
Merge pull request #519 from SRombauts/master

Corrected linking error in MSVC 2010 build + perf/projects compilation