Update copyright year to 2013. 


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5121 3789f03b-4d11-0410-bbf8-ca57d06f2519
Update more copyrights to 2013. 


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5122 3789f03b-4d11-0410-bbf8-ca57d06f2519