w32: Fix debug print on 64-bit machine.
* src/w32-io.c (release_hddesc): Cast SOCKET to (void *) and use %p. (reader, create_reader, destroy_reader, writer): Likewise. (create_writer, find_writer): Likewise. (_gpgme_io_socket): Likewise. Add "z" modifier for NFDS.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>