build qt5 policykit earlier

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2967 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
cmake: freeze at 3.0.0 as the later version was causing issues with kcoreaddons not installing all the headers

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2968 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9