ZLIB - update to 1.2.1

[Jonathan Larmour]

Gary Thomas wrote:
> Primarily for much better/complete handling of gzip compatible streams.

Shouldn't CYGSEM_COMPRESS_ZLIB_DEFLATE_MAKES_GZIP toggle NO_GZCOMPRESS and 
NO_GZIP ?

Is it too late to define Z_PREFIX?

Jifl
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