configure.ac: Support --disable-maintainer-mode

This

| allows you to choose whether the so called "rebuild rules" should be
| enabled or disabled.  With AM_MAINTAINER_MODE([enable]), they are
| enabled by default, otherwise they are disabled by default.  In the
| latter case, if you have AM_MAINTAINER_MODE in configure.ac, and run
| `./configure && make', then make will *never* attempt to rebuild
| configure, Makefile.ins, Lex or Yacc outputs, etc.  I.e., this
| disables build rules for files that are usually distributed and that
| users should normally not have to update.
|
| The user can override the default setting by passing either
| `--enable-maintainer-mode' or `--disable-maintainer-mode' to
| configure.
|
| People use AM_MAINTAINER_MODE either because they do not want their
| users (or themselves) annoyed by timestamps lossage (see CVS), or
| because they simply can't stand the rebuild rules and prefer running
| maintainer tools explicitly.

[ https://www.gnu.org/software/automake/manual/automake.html ]

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