fix compilation with Qt < 4.6
fix compilation with Qt < 4.6

svn path=/trunk/KDE/kdeedu/marble/; revision=1060769

quannt24/marble,rku/marble,David-Gil/marble-dev,utkuaydin/marble,AndreiDuma/marble,quannt24/marble,quannt24/marble,rku/marble,David-Gil/marble-dev,rku/marble,tzapzoor/marble,oberluz/marble,rku/marble,AndreiDuma/marble,David-Gil/marble-dev,tucnak/marble,probonopd/marble,tzapzoor/marble,oberluz/marble,tucnak/marble,AndreiDuma/marble,rku/marble,Earthwings/marble,quannt24/marble,oberluz/marble,quannt24/marble,utkuaydin/marble,David-Gil/marble-dev,adraghici/marble,adraghici/marble,probonopd/marble,tzapzoor/marble,adraghici/marble,Earthwings/marble,adraghici/marble,utkuaydin/marble,David-Gil/marble-dev,Earthwings/marble,probonopd/marble,oberluz/marble,Earthwings/marble,probonopd/marble,adraghici/marble,tzapzoor/marble,tzapzoor/marble,David-Gil/marble-dev,tucnak/marble,tucnak/marble,rku/marble,probonopd/marble,quannt24/marble,AndreiDuma/marble,probonopd/marble,AndreiDuma/marble,utkuaydin/marble,tucnak/marble,probonopd/marble,utkuaydin/marble,utkuaydin/marble,tucnak/marble,oberluz/marble,tzapzoor/marble,AndreiDuma/marble,quannt24/marble,tzapzoor/marble,Earthwings/marble,adraghici/marble,tucnak/marble,Earthwings/marble,tzapzoor/marble,oberluz/marble