lib: split _ctype[] into its own object, under lib/

lib: split _ctype[] into its own object, under lib/

This is, besides for tidying, in preparation of then starting to use an
archive rather than an object file for generic library code which
arch-es (or even specific configurations within a single arch) may or
may not need.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>