* Makefile.in (Makefile): Use it for its timestamp value as well, and
make it depend on all other */.in files.
(src/Makefile, src/config.stamp, lib-src/Makefile)
(doc/emacs/Makefile, doc/misc/Makefile, doc/lispref/Makefile)
(doc/lispintro/Makefile, oldXMenu/Makefile, lwlib/Makefile)
(leim/Makefile, lisp/Makefile): Remove those overlapping targets.
(leim, ${SUBDIR}, blessmail): Only depend on Makefile now.
* configure.in: Don't create src/config.stamp any more.