[issue30353] ctypes: pass by value for structs broken on Cygwin/MinGW 64-bit

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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resolution:  -> fixed
stage: backport needed -> resolved
status: open -> closed
versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30353>
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