[2.7] bpo-29565: Corrected ctypes passing of large structs by value on Windows AMD64. (#168) #8625
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Fixed bpo-29565: Corrected ctypes passing of large structs by value.
Added code and test to check that when a structure passed by value
is large enough to need to be passed by reference, a copy of the
original structure is passed. The callee updates the passed-in value,
and the test verifies that the caller's copy is unchanged. A similar
change was also added to the test added for bpo-20160 (that test was
passing, but the changes should guard against regressions).
(cherry picked from commit a86339b)
https://bugs.python.org/issue29565