[issue41977] ctypes array inside structure requires explicit garbage collection

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[issue41977] ctypes array inside structure requires explicit garbage collection

New submission from Maximilian Pichler : If we initialize a `Structure` with two fields as... ```python s = S() s.x = (c_int * 10**8)() s.y = s.x ``` ...and then delete it with ```del s```, the memory allocated for the array is not freed until `gc.collect()` is called. If instead we initalize