Make bin/ooniprobe-dev portable
Make bin/ooniprobe-dev portable

- use a portable recipe to get the absolute path of the toplevel
  directory where ooni-probe sources are located [1]

- make sure we exit with a meaningful error message if it is not
  possible to get the toplevel directory name

- while there put quotes around $@ since according to [2] this
  is the best way to forward shell script arguments

.. [1] http://serverfault.com/questions/40144

.. [2] http://stackoverflow.com/questions/255898/how-to-iterate-over-arguments-in-bash-script/256225#256225

juga0/ooni-probe,0xPoly/ooni-probe,juga0/ooni-probe,0xPoly/ooni-probe,juga0/ooni-probe,0xPoly/ooni-probe,0xPoly/ooni-probe,juga0/ooni-probe