[PSDK][REACTOS] Fix definitions and usage of DWLP_MSGRESULT, DWLP_DLGPROC, and DWLP_USER

- Make sure the DWLP_* values are correct on _WIN64
- Don't use the DWL_* constants, they are not portable. Enforce this by removing them entirely from winuser.h
- Make sure Get/SetWindowLong*Ptr* is used and pointers are not truncated to LONG

modules/rosapps/lib/vfdlib/vfdlib.h

@@ -10,6 +10,10 @@
 #ifndef _VFDLIB_H_
 #define _VFDLIB_H_
 
+#ifdef __REACTOS__
+#define DWL_USER DWLP_USER
+#endif
+
 #define VFD_LIBRARY_FILENAME	"vfd.dll"
 
 #ifdef VFD_EMBED_DRIVER