ffi: ptr types map between nil and null pointers.

On the way out, if a ptr or ptr-in type encounters nil, it
passes a null pointer. On the way in, a null C pointer
received by a ptr type turns to the nil object.

* ffi.c (ffi_ptr_in_put, ffi_ptr_in_d_put, ffi_ptr_out_put,
ffi_ptr_put): Check for nil, and put out null pointer in that
case.  (ffi_ptr_out_get, ffi_ptr_out_d_get): Check for null
pointer coming in and turn to nil.

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