osx: added missing files to xcode project

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2795 86ba831e-150c-0410-ab35-e06eaae15ed9
Random changes during code audits.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2797 86ba831e-150c-0410-ab35-e06eaae15ed9
Warning fixes from printz's list.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2798 86ba831e-150c-0410-ab35-e06eaae15ed9