Remove snprintf MSVC workaround as VTK requires VS2015

Common/Core/vtkConfigure.h.in

@@ -147,12 +147,4 @@
 # define VTK_HAS_STD_UNIQUE_PTR
 #endif
 
-/* MS Visual Studio 2015 finally supports C99/C++11's snprintf but
- * for older versions, use _snprintf instead. Annoyingly, its semantics
- * are slightly different, but still better than using sprintf.
- */
-#if defined(_MSC_VER) && (_MSC_VER < 1900)
-# define snprintf _snprintf
-#endif
-
 #endif // vtkConfigure_h