ffi: add ptr-in-d and ptr-out-d.

ptr-in-d means we pass a buffer to the foreign function,
which it owns and must free. We don't touch it.
ptr-out-d is meaningful for returned values. It means
that the function returned the object in a malloced
buffer which the caller owns. It will be freed.

* ffi.c (ptr_in_d_s, ptr_out_d_s): New symbol variables.
(ffi_ptr_in_d_put, ffi_ptr_out_d_get): New static functions.
(make_ffi_type_pointer): Don't set rtsize unconditionally
to 1. If we are passed a null pointer for the in function,
set it to zero. ptr-in-d does this: it has no need to free
the buffer since the called function owns it and so
there is no in function for that type.
(ffi_type_compile): Handle ptr_in_d_s and ptr_out_d_s.
(ffi_init): Initialize ptr_in_d_s and ptr_out_d_s.

* ffi.h (ptr_in_d_s, ptr_out_d_s): Declared.

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