Added 'return platform' to registerReferencePlatform() -- VisualStudio...

Added 'return platform' to registerReferencePlatform() -- VisualStudio complained about no return value
Added #include "../sfmt/SFMT.h" to SimTKOpenMMUtilities.h to get 'uint32_t' declaration

platforms/reference/src/ReferencePlatform.cpp

@@ -39,6 +39,7 @@ using namespace OpenMM;
 ReferencePlatform* registerReferencePlatform() {
     ReferencePlatform* platform = new ReferencePlatform();
     Platform::registerPlatform(platform);
+	return platform;
 }
 
 ReferencePlatform* staticPlatform = registerReferencePlatform();

platforms/reference/src/SimTKUtilities/SimTKOpenMMUtilities.h

@@ -28,6 +28,7 @@
 // class of shared, static utility methods
 
 #include "SimTKOpenMMCommon.h" 
+#include "../sfmt/SFMT.h"
 
 #include <stdio.h>
 #include <string.h>