make QCString::contains faster
make QCString::contains faster

svn path=/trunk/kdenetwork/kmail/; revision=186815

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