Working armhf build on ODROID-U3 running Ubuntu 14.04.1

Hello there,

Here are the (relatively minor) changes I made to get Cura running on an [ODROID](http://www.hardkernel.com/main/products/prdt_info.php?g_code=G138745696275) quad-core ARM board running Ubuntu 14.04.1. They should also be applicable to people running Ubuntu (or an Ubuntu chroot) on other development boards, Chromebooks, etc.