IDE: compile package: hide msg unit not used by main unit

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45126 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: fixed compilation

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45127 4005530d-fff6-0310-9dd1-cebe43e6787f