Use more relative file and directory names in `lisp' make rules.

Use more relative file and directory names in `lisp' make rules.
* lisp/Makefile.in (EMACS): Arrange for it to work when we chdir.
(setwins, setwins_almost, setwins_for_subdirs):
Don't `cd'; output relative names.
(all, compile, compile-always, compile-last): Set emacswd.
(custom-deps, finder-data, autoloads, update-subdirs, compile-last):
Just cd to the lisp source dir so we can use relative file names.
* src/Makefile.in (bootstrap_exe): Use an absolute name.