[m-rev.] for review 1/3: Move pointer/equals to new private shared library module.

[Julien Fischer]

On Fri, 28 Jun 2013, Paul Bone wrote:

> For review by Julien.
>
> Move pointer/equals to new private shared library module.
>
> This will allow other library code to use this predicate.
>
> library/private.m:
> library/version_hash_table.m:
>    As above.
>
>    I've created the new module private.m for any code that is shared amoung
>    library modules but is intended for Mercury implementors.  Unlike
>    private_builtin.m the predicates in private.m are not builtin.

Why add a new module?  This should just go in private_builtin.

Cheers,
Julien.