Python3.5+: Fix, importing extension modules with "defs" was not fully compatible.
Python3.5+: Fix, importing extension modules with "defs" was not fully compatible.

* This could lead to errors in case of cyclic dependencies involving
  extension modules.

* This at least affected Numpy 1.18

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka