[PATCH v5 1/2] user32/tests:Add test function Used to verify the child window Z order problem.

[cuijiajin]

I found that the z-order of window on WIN system will not change when HWND_TOPMOST and HWND_NOTOPMOST attributes are set for the same level window with WS_CHILD style, but it will change in wine, resulting in the problem of overlapping window, so I wrote a test function to explain this problem.

v2：
Add git log information
v3:
Move the path to fixup_flags function, only used to fix SetWindowPos function problem.
v4:
Divide a path into two pathes, better explain the prolem.
v5:
Add todo_wine to test patch[patch v5 1/2], and optimize fixup_flags[patch v5 2/2].  

Signed-off-by: cuijiajin <cuijiajin at uniontech.com>
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