[issue4751] Patch for better thread support in hashlib

[Lukas Lueg]

Lukas Lueg <knabberknusperhaus at yahoo.de> added the comment:

The lock is created while having the GIL in EVP_update. No other
function releases the GIL (besides the creator-function which does not
need the local lock).

Thereby no other thread can be in between ENTER and LEAVE while the lock
is allocated.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4751>
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