Added a function to set a sound's position relative to the listener git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/trunk@1059 4e206d99-4929-0410-ac5d-dfc041789085
git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/trunk@1002 4e206d99-4929-0410-ac5d-dfc041789085