Fix build on VC2015

On VC2015 the project wouldn't build because of the missing typedefs.
This was tested on both 2013 and 2015.

src/nvcore/DefsVcWin32.h

@@ -1,4 +1,4 @@
-// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
+// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
 
 #ifndef NV_CORE_H
 #error "Do not include this file directly."
@@ -52,6 +52,8 @@
 
 #define NV_THREAD_LOCAL __declspec(thread)
 
+#include <stdint.h>
+
 /*
 // Type definitions
 typedef unsigned char       uint8;