Use relative filenames in TAGS files.

Use relative filenames in TAGS files.

* src/Makefile.in (abs_srcdir): Remove it again.
(.PHONY): Remove frc.
(maintainer-clean): No more TAGS-LISP file.
(TAGS): Pass relative file names to etags.
(../lisp/TAGS): Rename from TAGS-LISP.  Work in ../lisp.

* lisp/Makefile.in (lisptagsfiles1, lisptagsfiles2, lisptagsfiles3)
(lisptagsfiles4, TAGS): Use relative file names.
(TAGS-LISP): Remove.
(maintainer-clean): No more TAGS-LISP file.

* lwlib/Makefile.in (abs_srcdir): Remove it again.
(ctagsfiles, TAGS): Use relative filenames.

* .bzrignore: Remove TAGS-LISP.