[kde-base/step] Remove unused dependencies.

cln is used only indirectly via qalculate.
gmm is no longer used since upstream commit b7c96970b004e882156456bf64e70edebd3b116f.

Package-Manager: portage-2.2.8-r1
[kde-base/kdm] DEPEND on sys-apps/systemd-sysv-utils to fix bug #479426. Thanks to Manuel "Sput" Nickschas for the hint.

Package-Manager: portage-2.2.8-r1