user32: Add RealChildWindowFromPoint.

dlls/user32/user32.spec

@@ -542,7 +542,7 @@
 @ stdcall PtInRect(ptr double)
 @ stub QuerySendMessage
 # @ stub QueryUserCounters
-@ stub RealChildWindowFromPoint
+@ stdcall RealChildWindowFromPoint(long double)
 @ stdcall RealGetWindowClass(long ptr long) RealGetWindowClassA
 @ stdcall RealGetWindowClassA(long ptr long)
 @ stdcall RealGetWindowClassW(long ptr long)

dlls/user32/winpos.c

@@ -433,6 +433,14 @@ HWND WINAPI ChildWindowFromPoint( HWND hwndParent, POINT pt )
 }
 
 /*******************************************************************
+ *		RealChildWindowFromPoint (USER32.@)
+ */
+HWND WINAPI RealChildWindowFromPoint( HWND hwndParent, POINT pt )
+{
+    return ChildWindowFromPointEx( hwndParent, pt, CWP_SKIPTRANSPARENT );
+}
+
+/*******************************************************************
  *		ChildWindowFromPointEx (USER32.@)
  */
 HWND WINAPI ChildWindowFromPointEx( HWND hwndParent, POINT pt, UINT uFlags)