fix #34855, define datarootdir and rm autom4tc.cache in Makefile.in

fix #34855, define datarootdir and rm autom4tc.cache in Makefile.in

* Makefile.in(datarootdir): defined @datarootdir@, fixed #34855
https://sourceforge.jp/ticket/browse.php?group_id=9668&tid=34855
When "autoreconf; ./configure; make install", the installation
directory changes to /emacs/site-lisp/egg/
from /usr/local/share/emacs/site-lisp/egg/.
Autoconf-2.69 dedines @lispdir@ as ${datarootdir}/emacs/site-lisp, but
Makefile.in undefined datarootdir.
* configure: reconfigured.
* Makefile.in(distclean): added rm -rf autom4tc.cache/ .
* .gitignore: added /autom4te.cache.
And modified config.* to /config.*

	modified:   .gitignore
	modified:   ChangeLog
	modified:   Makefile.in
	modified:   configure