* scd/apdu.c (pcsc_thread): Use an independent context.
Fix initialization of RDRSTATES. Call scd_kick_the_loop when
detecting any change.
(open_pcsc_reader): No requirement for periodical check.
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GnuPG-bug-id: 5437
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>