kde_cmake: update class to search for cmake files in the libdir
kde_cmake: update class to search for cmake files in the libdir

KDE projects provide their cmake files in ${libdir}/cmake

Signed-off-by: Samuel Stirtzel <5e7b27e76d616174d4c71d96463fdd2f7e57e559@googlemail.com>

koenkooi/meta-kde4,koenkooi/meta-kde4,Angstrom-distribution/meta-kde,Angstrom-distribution/meta-kde