MFC r340204:

MFC r340204:
Cleanup locale tools:

- Simplify the source dir specification, and update README
  appropriately
- Drop the LC (doonly) processing, it's broken, and even if fixed, not
  really useful
- Don't remove the target directories while installing new data as it
  removes Makefile.depend which we don't manage; only rm the files we
  are going to add/replace/delete instead
- Restrict adding bsd.endian.mk to colldef and ctypedef Makefiles, it's
  not needed in other (text-only) categories
- GC unused scripts; they don't seem to be particularly helpful standalone
  as well

Reviewed by:	bapt
Differential Revision:	https://reviews.freebsd.org/D17858