tools/libs: honor build dependencies for recently moved subdirs

tools/libs: honor build dependencies for recently moved subdirs

While the lack of proper dependency tracking of #include-d files is
wider than just the libs/ subtree, dealing with the problem universally
there or  in tools/Rules.mk is too much of a risk at this point in the
release cycle. Add the missing inclusion of $(DEPS_INCLUDE) only in the
specific Makefile-s, after having checked that their prior Makefile-s
had such includes.

Interestingly the $(DEPS_RM) use is present in tools/libs/libs.mk's
clean target, so doesn't need taking care of in individual Makefile-s.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Wei Liu <wl@xen.org>
Release-acked-by: Ian Jackson <iwj@xenproject.org>