Currently autobake-debs.sh does not pass shellcheck
it fails making errors:

 * SC1091 when using shellcheck -x it needs to know where to
   find ./VERSION. As this is not needed we just specify it
   as /dev/null as mentioned in shellcheck documentation:
   https://www.shellcheck.net/wiki/SC1091

 * SC2086 make sure that there is no globbing or word splitting
   in dpkg-buidpackage string. This not big problem or about to happen
   but now extra parameter parsing is more Bash compliant with
   using array.
   Change BUILDPACKAGE_PREPEND to BUILDPACKAGE_DPKGCMD which holds
   'eatmydata' if it's available and needed 'dpkg-buildpackage'
   https://www.shellcheck.net/wiki/SC2086

Fix small script indentation problem.