winex11: Add support for receiving mouse events on non-toplevel windows.

dlls/winex11.drv/event.c

@@ -1490,7 +1490,7 @@ UINT CDECL X11DRV_SendInput( UINT count, LPINPUT inputs, int size )
         switch(inputs->type)
         {
         case INPUT_MOUSE:
-            X11DRV_send_mouse_input( 0, inputs->u.mi.dwFlags, inputs->u.mi.dx, inputs->u.mi.dy,
+            X11DRV_send_mouse_input( 0, 0, inputs->u.mi.dwFlags, inputs->u.mi.dx, inputs->u.mi.dy,
                                      inputs->u.mi.mouseData, inputs->u.mi.time,
                                      inputs->u.mi.dwExtraInfo, LLMHF_INJECTED );
             break;

dlls/winex11.drv/x11drv.h

@@ -805,7 +805,7 @@ extern BOOL CDECL X11DRV_ClipCursor( LPCRECT clip );
 extern void X11DRV_InitKeyboard( Display *display );
 extern void X11DRV_send_keyboard_input( WORD wVk, WORD wScan, DWORD dwFlags, DWORD time,
                                         DWORD dwExtraInfo, UINT injected_flags );
-extern void X11DRV_send_mouse_input( HWND hwnd, DWORD flags, DWORD x, DWORD y,
+extern void X11DRV_send_mouse_input( HWND top_hwnd, HWND cursor_hwnd, DWORD flags, DWORD x, DWORD y,
                                      DWORD data, DWORD time, DWORD extra_info, UINT injected_flags );
 extern DWORD CDECL X11DRV_MsgWaitForMultipleObjectsEx( DWORD count, const HANDLE *handles, DWORD timeout,
                                                        DWORD mask, DWORD flags );