Build elisp files all at once instead of one by one.

Build elisp files all at once instead of one by one.
* automake.in (handle_emacs_lisp): Define am__ELFILES.  Add
elc-stamp to all's dependencies.
* lib/am/lisp.am (elc-stamp): New rule, build all *.elc files.
(.el.elc): Rewrite to call elc-stamp if $@ doesn't exist.
(clean-lisp): Clean elc-stamp.
* lib/elisp-comp: Reindent.  Erase the temporatry directory
from a trap.  Propagate Emacs's exit status.
* tests/lisp3.test: New file.
* tests/Makefile.am (TESTS): Add lisp3.test.
Reported by Ryan T. Sammartino.