cairocanvas: less hhints

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40703 4005530d-fff6-0310-9dd1-cebe43e6787f
lcl: gtk2: fixed warning

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40704 4005530d-fff6-0310-9dd1-cebe43e6787f