[GRASS-git] [OSGeo/grass] b8492c: docker: fix GRASS lib path detection (#883)

[Markus Neteler]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: b8492cf124745ae2d0658a866734e68217e9565d
      https://github.com/OSGeo/grass/commit/b8492cf124745ae2d0658a866734e68217e9565d
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2020-08-08 (Sat, 08 Aug 2020)

  Changed paths:
    M docker/debian/Dockerfile_debian_pdal
    M docker/ubuntu/Dockerfile_ubuntu_latest_pdal
    M docker/ubuntu/Dockerfile_ubuntu_pdal

  Log Message:
  -----------
  docker: fix GRASS lib path detection (#883)

- create generic GRASS GIS lib name regardless of version number in a robust way

Fixes #869