* scd/scdaemon.h (opt): Add field opcsc_shared.
* scd/scdaemon.c (opcscShared): New.
(opts): Add "--pcsc-shared".
(main): Set flag.
* scd/apdu.c (connect_pcsc_card): Use it.
(pcsc_get_status): Take flag in account.
* scd/app-openpgp.c (verify_chv2): Do not auto verify chv1 in shared
mode.
--
This option should in general not be used. The patch tries to limit
bad effects but using shared mode is somewhat dangerous depending on
the other PC/SC users.
(cherry picked from commit 5732e7a8e97cebf8e850c472e644e2a9b040836f)