Add forward declaration for QComboBox
Add forward declaration for QComboBox

svn path=/trunk/kdenetwork/knode/; revision=144112

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi