ffi: carrays able to reference objects.

The idea here is that carrays can have a pointer to some area
that is owned by another object. So that the area doesn't
disappear when the other object becomes garbage, a carray
which does this maintains a pointer to that other object.

* ffi.c (ffi_carray_get): Pass new parameter to make_carray.
(struct carray): New member, ref.
(carray_mark_op): Mark new ref member.
(make_carray): New parameter: the object which is stored in
the structure as ref.
(carray_dup): Null out the ref member. When a carray
is duplicated, it owns its own buffer, and henceforth mustn't
prevent the original object from being reclaimed.
(carray_own): Don't allow a carray to claim ownership
of the pointer if it references another object; we have
no protocol to inform that other object.

* ffi.h (make_carray): Declaration updated.

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