Stop files with same basename messing up finder's package--builtins

Stop files with same basename messing up finder's package--builtins

* lisp/Makefile.in (setwins_finder): New, excluding leim.
(finder-data): Use setwins_finder.

* lisp/finder.el (finder-no-scan-regexp): Add leim-list.
(finder-compile-keywords): Don't skip files with same basename.

Fixes: debbugs:14010