* fixed pong example to use stdlib instead of csfml-system git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1439 4e206d99-4929-0410-ac5d-dfc041789085
git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1356 4e206d99-4929-0410-ac5d-dfc041789085
git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/trunk@1002 4e206d99-4929-0410-ac5d-dfc041789085