Remove --disable-maintainer-mode option from 'configure'. (Bug#11555)
It is confusingly named and rarely useful. See, for example,
<http://lists.gnu.org/archive/html/emacs-devel/2011-12/msg00089.html>.
* INSTALL.BZR: Don't mention --disable-maintainer-mode.
* Makefile.in (MAINTAINER_MODE_FLAG): Remove; all uses removed.
* configure.in: Remove --disable-maintainer-mode.
(USE_MAINTAINER_MODE, MAINT): Remove.
* admin/make-tarball.txt: Don't worry about maintainer mode.
* etc/NEWS: Mention this.