WIP: begin the kernel-ng.eclass-based re-implementation

Signed-off-by: Gregory M. Tuner <gmt@be-evil.net>
eclass/no-sources: move the cleanup code into the eclass

Signed-off-by: Gregory M. Tuner <gmt@be-evil.net>
Include headers for any active kernel arch rather than hard-coding x86

Signed-off-by: Gregory M. Tuner <gmt@be-evil.net>
eclass-ng: clean up reporting during cleaning

Signed-off-by: Gregory M. Tuner <gmt@be-evil.net>