[issue4738] Patch to make zlib-objects better support threads

[ebfe]

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

Here is a small test-script with concurrent access to a single
compressosbj. The original patch will immediately deadlock.

The patch attached releases the GIL before trying to get the zlib-lock.
This allows the other thread to release the zlib-lock but comes at the
cost of one additional GIL lock/unlock.

Added file: http://bugs.python.org/file12531/zlib_threads-3.diff

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