Merge pull request #3617 from RosettaCommons/roccomoretti/update_submodule
Add a script to update compilation-needed submodules
Now that we're relying on submodules more heavily for things (especially that we're no longer prohibiting submodules for things necessary for compilation) we should have something which will automatically update needed submodules as part of the compilation process. This PR implements such a script, modelling it off of update_options.sh and the like.
To keep things clean, only the submodules needed for compilation are updated. The script has facilities to update a (currently empty) set of submodules needed for all compilation, as well as doing updates on an extras-dependent basis. -- Right now, only the extras=zeromq build has a non-trivial implementation. Other extras builds and the common case are no-ops. (Though things are implemented such that they can be added easily.)