removed old unused precompiled headers for msvc

libdevcore/_libdevcore.cpp

@@ -1,13 +0,0 @@
-#ifdef _MSC_VER
-#include "All.h"
-#include "Common.cpp"
-#include "CommonData.cpp"
-#include "CommonIO.cpp"
-#include "CommonJS.h"
-#include "FixedHash.cpp"
-#include "Guards.cpp"
-#include "Log.cpp"
-#include "RangeMask.cpp"
-#include "RLP.cpp"
-#include "Worker.cpp"
-#endif

libethcore/_libethcore.cpp

@@ -1,7 +0,0 @@
-#ifdef _MSC_VER
-#include "All.h"
-#include "BlockInfo.cpp"
-#include "CommonEth.cpp"
-#include "ProofOfWork.cpp"
-#include "Exceptions.cpp"
-#endif

libevm/_libevm.cpp

@@ -1,6 +0,0 @@
-#ifdef _MSC_VER
-#include "All.h"
-#include "ExtVMFace.cpp"
-#include "FeeStructure.cpp"
-#include "VM.cpp"
-#endif

libp2p/_libp2p.cpp

@@ -1,9 +0,0 @@
-#ifdef _MSC_VER
-#include "All.h"
-#include "Capability.cpp"
-#include "Common.cpp"
-#include "Host.cpp"
-#include "HostCapability.cpp"
-#include "Session.cpp"
-#include "UPnP.cpp"
-#endif