updated the repository location of mjpg-streamer per the message

returned from svn when attempting to checkout using the old repo
URL.
Previous repo URL: https://mjpg-streamer.svn.sourceforge.net/svnroot/mjpg-streamer/mjpg-streamer/
New repo URL: https://svn.code.sf.net/p/mjpg-streamer/code/mjpg-streamer