fix warning, make dtor virtual
fix warning, make dtor virtual

svn path=/branches/work/akonadi-ports/kdepim/; revision=1035120

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