[patch, fortran] Fix pointers not escaping via C_PTR

[Thomas Koenig]

I wrote:

> First, this talks about a C pointer having a target.  Second, you can
> re-estabilsh the association to a different pointer to the Fortran
> program.

There is another point to consider: This is interoperability with C
we are dealing with, so we also have to follow C semantics.
And, love it or hate it, C pointers escape.

So, OK for trunk?

Regards

	Thomas