[Core] Added POSIX support (Experimental)

Thanks to Danman
I don't think it actually compile although tried my best to correct
code.


Former-commit-id: c3366c2c924f7392f4d46824dafca63ecf7f1fea

src/Nazara/Core/Posix/ClockImpl.hpp

@@ -0,0 +1,16 @@
+// Copyright (C) 2012 Alexandre Janniaux
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_CLOCKIMPL_POSIX_HPP
+#define NAZARA_CLOCKIMPL_POSIX_HPP
+
+#include <Nazara/Prerequesites.hpp>
+
+bool NzClockImplInitializeHighPrecision();
+nzUInt64 NzClockImplGetMicroseconds();
+nzUInt64 NzClockImplGetMilliseconds();
+
+#endif // NAZARA_CLOCKIMPL_POSIX_HPP