ffi: semantics: ptr-in should recurse on in.

* ffi.c (ffi_ptr_in_in): Don't just free the buffer for
the pointer itself, but call the in handler of the target
type if it has one. Pass a false copy flag to it, so that
that a ptr-in pass semantically resembles a by-value pass.
(ffi_ptr_in_d_in): New static function.
(ffi_type_compile): Give ptr-in-d type the ffi_ptr_in_d_in
function.

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