[GRASS-git] [OSGeo/grass] dca936: configure: upgrade to autoconf 2.69 (#1845)

[nilason]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: dca9364c64d7dac5b4ae9262f016708a97c979d7
      https://github.com/OSGeo/grass/commit/dca9364c64d7dac5b4ae9262f016708a97c979d7
  Author: nilason <n_larsson at yahoo.com>
  Date:   2021-09-22 (Wed, 22 Sep 2021)

  Changed paths:
    M aclocal.m4
    M config.guess
    M config.sub
    M configure
    A configure.ac
    R configure.in
    M docker/alpine/Dockerfile
    M docker/debian/Dockerfile
    M docker/ubuntu/Dockerfile
    M include/grass/Makefile
    M include/grass/config.h.in
    M lib/calc/calc.c
    M lib/gis/compress.h
    M lib/gis/env.c
    M lib/gis/pager.c
    M lib/manage/sighold.c
    M mswindows/osgeo4w/config.h.vc

  Log Message:
  -----------
  configure: upgrade to autoconf 2.69 (#1845)