[PATCH] Workaround to enable xdot.py to run correctly on Windows.

[Hugo Puhlmann]

Hi,

Since xdot.py is a python package, later on creating the process with
CreateProcessW will fail with a ERROR_BAD_EXE_FORMAT, as the script isn't
an actual executable binary. The solution introduced here is to prepend the
python interpreter found in the system to the argument list and starting
the process with these instead.

Although this isn't the most clean solution, I believe that since these
utilities are intended mostly for developers it should be an acceptable
solution.

Thanks,
-- 
Hugo S. K. Puhlmann
Software Development & IT - Team Leader
Santa Maria Design House (SMDH)
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