Preload leim-list.el

Preload leim-list.el

* Makefile.in (abs_builddir): New, set by configure.
(buildlisppath): Add leim/.
(epaths-force-w32): Set BLD.

* lisp/loadup.el: Load leim-list.el when found.

* lisp/startup.el (normal-top-level): Skip re-loading leim/leim-list.el.

* nt/epaths.nt (PATH_DUMPLOADSEARCH): Add leim/.

* src/callproc.c (init_callproc): Don't assume PATH_DUMPLOADSEARCH
is a single directory.

* src/epaths.in (PATH_DUMPLOADSEARCH): Add leim/.

Fixes: debbugs:4789