[issue4751] Patch for better thread support in hashlib

[ebfe]

ebfe <knabberknusperhaus at yahoo.de> added the comment:

Releasing the GIL is somewhat expensive and should be avoided if
possible. I've moved LEAVE_HASHLIB in EVP_update so the object gets
unlocked before we call Py_END_ALLOW_THREADS. This is *only* possible
because EVP_update does not use the object beyond those lines.

Here is a new patch and a small test-script.

Added file: http://bugs.python.org/file12533/hashopenssl_threads-4.diff

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