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Fix :func:`binascii.crc32` when it is compiled to use zlib'c crc32 to
work properly on inputs 4+GiB in length instead of returning the wrong
result. The workaround prior to this was to always feed the function
data in increments smaller than 4GiB or to just call the zlib module
function.
We also have :func:`binascii.crc32` release the GIL when computing
on larger inputs as :func:`zlib.crc32` and :mod:`hashlib` do.
This also boosts performance on Windows as it now uses the zlib crc32
implementation for :func:`binascii.crc32` for a 2-3x speedup.
That the stdlib has a crc32 API in two modules is a known historical
oddity. This moves us closer to a single implementation behind them.
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