os x dmg: fixed setting executable bit

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44237 4005530d-fff6-0310-9dd1-cebe43e6787f
FPDebug: starting plus minus operator

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44238 4005530d-fff6-0310-9dd1-cebe43e6787f