Add the SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER flag.

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-160 into branch/default

Created originally on Bitbucket by bdarnell (Ben Darnell)

Was already merged in Bitbucket before import, marked as merged by the import user

This disables a sanity check in openssl that can cause problems when it is used in non-blocking mode and the GC causes the address of a str object to change (https://bugs.pypy.org/issue1238).

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