Removed winuser16.h from x11drv.h.

diff --git a/include/winuser.h b/include/winuser.h
index 258f611..1e56ea5 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -648,7 +648,7 @@
 
 /****** Window classes ******/
 
-typedef struct
+typedef struct tagCREATESTRUCTA
 {
     LPVOID      lpCreateParams;
     HINSTANCE hInstance;
@@ -785,7 +785,7 @@
 #define DBGFILL_STACK  0xf7
 
   /* WM_WINDOWPOSCHANGING/CHANGED struct */
-typedef struct
+typedef struct tagWINDOWPOS
 {
     HWND  hwnd;
     HWND  hwndInsertAfter;