Moving a mutex include to precompiled header.

Author: stgates

Release/src/pch/stdafx.h

@@ -92,6 +92,7 @@
 #include <exception>
 #include <assert.h>
 #include <streambuf>
+#include <mutex>
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1800)
 #include <ppltasks.h>

Release/src/utilities/asyncrt_utils.cpp

@@ -25,8 +25,6 @@
 
 #include "stdafx.h"
 
-#include <mutex>
-
 #if defined(__cplusplus_winrt)
 using namespace Platform;
 using namespace Windows::Storage::Streams;