Update libzip to support utf-8 and others

[ts-soft]

Added Zip64 support (large file support)
Added UTF-8 support for file names, file comments, and archive comments
Changed API for name and comment related functions for UTF-8 support
Added zip_discard()
Added ZIP_TRUNCATE for zip_open()
Added zip_set_file_compression()
Added API for accessing and modifying extra fields
Improved API type consistency
Use gcc4's visibility __attribute__
More changes for Windows support
Additional test cases

http://www.nih.at/libzip/NEWS.html

and update the zippackerplugin