[issue4751] Patch for better thread support in hashlib

[ebfe]

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

haypo, the patch will not compile when WITH_THREADS is not defined. The
'lock'-member in the object structure is not present without
WITH_THREADS however the line 'if (self->lock == NULL && view.len >=
HASHLIB_GIL_MINSIZE)' will always refer to it.

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