[PATCH] python: Fix crash by leaving struct members intact

[Tobias Mueller]

hi.

Here's the test case for this crash, hoping that this fast-tracks this
patch.
It crashes reliably on my 32bit Debian system.
As Justus mentioned, this is blocking us here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=884900

Cheers,
  Tobi
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