[hash] Remove remaining TR1 and Boost fall-back code.
[buildsystem] Do not call check for Boost base.

With the removal of the fall-back code for many C++11 features
like shared_ptr or hash, we no longer need Boost in
dune-common.
If your model has relies on a boost check, add the call to
the buildsystem of your module. The Dune-islt commit
…3ee92f05012 is an example what must be done.