community/monitoring-plugins: upgrade to 2.4.0

(1) remove -lang subpackage, as localization files
    in the `po` directory have all been removed:

    https://github.com/monitoring-plugins/monitoring-plugins/commit/40370b8ff0332692c1d8d47c24ebda02b7a18823

(2) --with-ssh-command needs to be passed to
    ./configure for check_by_ssh plugin to be enabled