scd,pcsc: Remove the restriction of no-scanning in PC/SC.
* scd/apdu.h (app_open_reader): Remove the last argument. * scd/apdu.c (app_open_reader): Ditto. * scd/app.c (select_application): Don't supply APP_EMPTY.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>