add a cpp file for import libs

3rdParty/ReadMe.md

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+3rd party liibraries.
+Make sure every library folder contains it's required header files and compiled libs,
+which can be include like:
+#include "pthreads4w/pthread.h"
+
+and can be linked like in ImportLib.cpp, like:
+#pragma comment(lib, "../3rdParty/pthreads4w/libpthreadVCE3d.lib")

GPCS4/ImportLibs.cpp

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+#include "GPCS4Config.h"
+
+// links to static libs
+//
+// I don't do this in property settings page
+// because I found it doesn't support relative path.
+// e.g. "pthreads4w/libpthreadVCE3d.lib"
+// thus I'll have to add a lib directory in that settings page
+// every time I add a new lib. that's awful.
+
+
+#ifdef GPCS4_WINDOWS
+#ifdef _DEBUG
+
+#pragma comment(lib, "../3rdParty/pthreads4w/libpthreadVCE3d.lib")
+
+#else
+
+#pragma comment(lib, "../3rdParty/pthreads4w/libpthreadVCE3.lib")
+
+#endif  //_DEBUG
+#endif  //GPCS4_WINDOWS