* src/priv-io.h (struct spawn_fd_item_s): Use HANDLE for peer_name
field.
* src/dirinfo.c (read_gpgconf_dirs): Use ASSUAN_INVALID_FD for default
value for peer_name field of CFD.
* src/engine-gpgconf.c (gpgconf_read, gpgconf_write)
(gpgconf_query_swdb): Likewise.
* src/version.c (_gpgme_get_program_version): Likewise.
* src/w32-io.c (handle_to_fd): Remove.
(_gpgme_io_spawn): Assign HD to the peer_name field.  Use %p for
printing the value of peer_name field.
* src/gpgme-w32spawn.c (my_spawn): Use peer_name field with no cast.
Use %p for printing the value of peer_name field.  Remove wrong
CloseHandle calls.
(translate_get_from_file): Use HANDLE type for the TO variable.
Use strtoull on 64-bit machine.  Use ASSUAN_INVALID_FD.