scd: Fix for SCARD_IO_REQUEST structure.
* scd/apdu.c (struct pcsc_io_request_s): Use pcsc_dword_t for Windows.
This fix is for correctness and for the future when we will support
64-bit Windows.
- GnuPG-bug-id: T4454
- Suggested-by: Juris Ozols
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>