Check for version 1.1 of zlib C library and fail if gzip format is used
Check for version 1.1 of zlib C library and fail if gzip format is used

Version 1.1.x of the zlib C library does not support the 'gzip' format
via the in-memory api, only the 'raw' and 'zlib' formats. It does
support gzip format via the gzopen()/gzread() api but that is usable
only for files and is useless for the ByteString interface we provide.

tolysz/zlib,tolysz/zlib,tolysz/zlib