PDF: another series of changes to accomodate for poppler git HEAD

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25559 f0d54148-0727-0410-94bb-9a71ac55c965
PDF: another series of changes to accomodate for poppler git HEAD

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25560 f0d54148-0727-0410-94bb-9a71ac55c965