Fix strlcat and strlcpy compilation error in OS X

Fix ettercap 8 strlcat and strlcpy compilation error in OS X Mavericks .

![screen shot 2014-01-14 at 8 24 34 pm](https://f.cloud.github.com/assets/5146348/1912651/c530d2e8-7d3c-11e3-9f6c-bc40f017edb8.png)