WinRT: Enable native midi only on UWP

winrt/pal_config.h

@@ -48,7 +48,9 @@
 
 #define PAL_HAS_CONFIG_PAGE  1
 
-#define PAL_HAS_NATIVEMIDI  1
+#if NTDDI_VERSION >= NTDDI_WIN10
+# define PAL_HAS_NATIVEMIDI  1
+#endif
 
 #define PAL_FILESYSTEM_IGNORE_CASE 1