Removed unneeded Zlib files from Xcode project

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2368 86ba831e-150c-0410-ab35-e06eaae15ed9
xcode: arranged header and source files in the same groups.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2369 86ba831e-150c-0410-ab35-e06eaae15ed9