Wrong number of files returned for more that 65535 entries

```
What steps will reproduce the problem?
1. Open a zip file with more than 65535 entries
2. Use the mz_zip_reader_get_num_files function to read it and you'll see it 
returns 65535 entries, instead of the correct value.

What version of the product are you using? On what operating system?
trunk



```

Original issue reported on code.google.com by `mingo...@gmail.com` on 5 Jul 2014 at 12:10
