openglcontrol: allow using in QT Lazarus IDE

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46933 4005530d-fff6-0310-9dd1-cebe43e6787f
examples: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46934 4005530d-fff6-0310-9dd1-cebe43e6787f
example: openglcontrol: workaround for qt

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46935 4005530d-fff6-0310-9dd1-cebe43e6787f