Merge pull request #3819 from thedax/2012BuildFix

Build fix for VS 2012.

GPU/Directx9/TextureScalerDX9.cpp

@@ -15,6 +15,13 @@
 // Official git repository and contact information can be found at
 // https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
 
+// On Visual Studio 2012, include this before anything else so
+// _VARIADIC_MAX gets set to 10, to avoid std::bind compile errors.
+// See header file for reasons why.
+#if defined(_WIN32) && _MSC_VER == 1700
+#include "../native/base/basictypes.h"
+#endif
+
 #include "GPU/Directx9/TextureScalerDX9.h"
 
 #include "Core/Config.h"