Bug#986527: Patches for flaky build and cython unavailability

[Ahzo]

Aug 3, 2021, 11:12 by thansen at debian.org:

> Thanks a lot for the patches Ahzo. Especially fixing the file handle leak should help a lot.
>

Actually that patch was rather a workaround than a fix.

The real cause of the "Too many open files" issue is a behavior change of the multiprocessing.Process class in python3.
It now opens a pipe internally, which it did not do in python2.

The solution is to call the close() method of multiprocessing.Process to close the internal pipe.
Attached u2-close-the-internal-pipe-of-multiprocessing.Process.patch does just that.
However, this method was only added in python 3.7, so attempting to use it fails in earlier versions of python3 (and also in python2).

Regards,
Ahzo
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