add dune-common to the list of modules depended on by dune.module

since dune.module is primarily required for dunecontrol support and
you cannot run dunecontrol without dune-common anyway, nothing changes
for dunecontrol users.

for users who do not use dunecontrol, nothing changes either because
the dependencies are specified in opm-common-prereqs.cmake which stays
untouched by this commit.

dune.module

@@ -10,3 +10,4 @@ Label: 2018.04-pre
 Maintainer: opm@opm-project.org
 MaintainerName: OPM community
 Url: http://opm-project.org
+Depends: dune-common