[issue4751] Patch for better thread support in hashlib

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Updated patch:
 - change HASHLIB_GIL_MINSIZE to 2048 bytes
 - update hashlib documentation: add a note about the 2048 GIL limit
 - write a small test just for more sure that the GIL cases are tested 
(GIL released during object creation or on update)

Added file: http://bugs.python.org/file12620/hashlibopenssl_small_lock-5.diff

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<http://bugs.python.org/issue4751>
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