Update ruby-zlib package to 0.6.0.

Changes from 0.5 to 0.6

 o New methods:
     - Zlib::GzipFile.wrap
     - Zlib::GzipFile#finish
 o New constants:
     - Zlib::ZLIB_VERSION
     - Zlib::OS_VMCMS
     - Zlib::OS_ZSYSTEM
     - Zlib::OS_CPM
     - Zlib::OS_QDOS
     - Zlib::OS_RISCOS
     - Zlib::OS_UNKNOWN
 o Changed methods:
     - Zlib::GzipFile.new now takes no block. Use Zlib::GzipFile.wrap instead.
     - Zlib::GzipFile#close now takes no argument. Use Zlib::GzipFile#finish
        instead.
 o Renamed methods:
     - Zlib.version is renamed to Zlib.zlib_version.
 o Changed constants:
     - Zlib::VERSION indicates the version of Ruby/zlib. The zlib.h version is
        now in Zlib::ZLIB_VERSION.
 o Backward compatibility:
     - For backward compatibility for 0.5, the obsoleted methods and arguments
        are still available.
     - Obsoleted classes, methods, and constants for backward compatibility
        for 0.4 or earlier are removed.

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