Update Makefile for matlab interface

[felicif]

Add missing qpOASES_auxInput.m to list of files to be copied to bin/

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}