Excessive headers in stdafx.h

[Hsilgos]

File Release/src/pch/stdafx.h contains following headers:

#include "boost/thread/condition_variable.hpp"
#include "boost/thread/mutex.hpp"

which are not used. Instead of them std::thread and std::condition_variable are used all over the code (at least I haven't found any usage of boost::thread or boost::condition_variable).