[PATCH v5] user32: Add MOUSEHOOKSTRUCTEX to improve mouse wheel support

[Alex Henrie]

+typedef struct
+{
+    struct { /* MOUSEHOOKSTRUCT */
+        POINT pt;
+        HWND  hwnd;
+        UINT  wHitTestCode;
+        ULONG_PTR dwExtraInfo;
+    } DUMMYSTRUCTNAME;
+    DWORD           mouseData;
+} MOUSEHOOKSTRUCTEX, *PMOUSEHOOKSTRUCTEX, *LPMOUSEHOOKSTRUCTEX;

Other than the excessive indentation in "DWORD           mouseData",
this patch looks good, and the user32 tests still pass on my machine.

-Alex