Remove the unneeded Mutex.h file

Source/PS_Source/Mutex.h

@@ -1,20 +0,0 @@
-/*
-  Copyright (C) 2006-2011 Nasca Octavian Paul
-  Author: Nasca Octavian Paul
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of version 2 of the GNU General Public License 
-  as published by the Free Software Foundation.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License (version 2) for more details.
-
-  You should have received a copy of the GNU General Public License (version 2)
-  along with this program; if not, write to the Free Software Foundation,
-  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
-*/
-#pragma once
-#include <mutex>
-using Mutex = std::mutex;