Python libclang and get_includes() returning duplicate entries

Question

For a simple C++ file:

#include <Windows.h>

int main()
{
    int a = 1;
    int b = 2;

    return 0;
}

Calling tu.get_includes(), returns a lot of header files and more especially redundant entries.

Do you have any thoughts?

...
...\um\winnt.h
...\um\winnt.h
...
...\um\winnt.h
...\um\winnt.h
...\um\winnt.h
...\um\winnt.h
...\um\winperf.h
...\um\winperf.h
...\um\winreg.h
...\um\winscard.h
...\um\winscard.h
...\um\winscard.h
...\um\winsock.h
...\um\winuser.h
...\um\winuser.h
...\um\winuser.h
...\um\winver.h
...