automake: algol68: rename A68C and A68CFLAGS back to A68 and A68FLAGS.

From https://bugs.gnu.org/78518, discussion at 78481
(both automake-patches).

* bin/automake.in: Rename A68C and A68CFLAGS to A68 and A68FLAGS.
* doc/automake.texi: Likewise.
* configure.ac: Rename GNU_A68C and GNU_A68FLAGS to GNU_A68 and
GNU_A68FLAGS.
* lib/Automake/Variable.pm: Likewise.
* t/a68-demo.sh: Likewise.
5 files changed