kxerrorhandler duplicate

[Benjamin Port]

In the kdeui crumble I'm currently on: KWindowsSystem, there is a task for 
./util/kxerrorhandler.h but KWindowsSystem have already one kxerrorhandler.
So I don't know what I need to do.
The 2 files are really similar only one deprecated constructor is present in 
the file present in kdeui. And this files is exported and install the header, 
not the file already in KWindowsSystem.

Thanks for help,

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Benjamin Port