Minizip url broken

http://www.winimage.com/zLibDll/unzip101e.zip

While compiling, the minizip download failed as the site refused to connect
![screenshot from 2017-04-24 15-04-49](https://cloud.githubusercontent.com/assets/13484424/25338395/66c39b38-28ff-11e7-85f5-59baa81d6415.png)
