Adds the necessary distinctions in the system abstraction layers.

(cherry picked from commit 23b34d1adafa71612f093d6b5aa015f307785a3f)

After of the vos removal, some classes in other parts of the code now
are subclasses of SimpleReferenceObject.

To avoid compilation and linking errors in those other parts, we seem
to need to have the operator new[] and operator delete[] in
SimpleReferenceObject as protected instead of private. We also need an
implementation of operator delete[]. As it can be unimplemented with
gcc, I hope it isn't actually called, though, so it for now crashes
intentionally if called.

Will see later if this actually works, this is just a commit to make
stuff build.

Commit 55c3066e52ad1843549c442e8d74f886507c58f4 seems to break the SUSE boxes,
this is a workaround for that.

In practice the changeset is 'inspired' by vosremoval-mutex.diff
but was essentially redone manually