[Bro] Libcaf errors

[Matthias Vallentin]

> Bro compiled successfully with the fix you provided. 

Good to know, we'll integrate the fix then.

> 3. Copied the contents of the just cloned/merged broker fix branch into
> Bro's broker directory (this and step 2 could have been done directly using
> git, but not sure how :) ):

Once we've updated the submodules in the Bro repo, this will no longer
be necessary. (Instead of copying, another ad-hoc fix would simply
involve changing the SHA of the broker submodule and then update your
submodules again.)

    Matthias