libzen: 0.4.32 -> 0.4.33

Built and tested locally.

From the changelog:
```
Version 0.4.33, 2016-02-29

x File::Open(): using now FILE_APPEND_DATA on windows when append mode
  is requested
x File::Open(): accept file names with * and ? characters on non-Windows
  platforms
x Better MinGW and CygWin compatibility
x autogen.sh: Adding missing shebang
x Dir/Create: create the parents directory if not existing
```

Additionally, the package was cleaned up, now using `autoreconfHook` and
with some helpful pointers by @hrdinka.