Printers, made the cairo postscript canvas the default for cups backend (gtk2), printing latin, greek, cyrillic, arabic, chinese, etc. should now work, fixes issues 15161 and 19435

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40677 4005530d-fff6-0310-9dd1-cebe43e6787f