bpo-30353 Fix pass by value for structs on 64-bit Cygwin/MinGW#1559

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vsajip merged 3 commits intopython:masterfrom

embray:issue-30353

Jun 7, 2017

Commits on May 12, 2017

Fix pass by value for structs on 64-bit Cygwin/MinGW
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Commits on May 19, 2017

Apply this workaround in builds for the arm64 architecture, on which libffi has a similar bug; fixes https://bugs.python.org/issue29804
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Commits on May 23, 2017

Reworked after gaining a better understanding of what was going on.
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