poldi: [PATCH] Add option 'killscd'.

[Ben Kibbey]

According to the manual page of scdaemon, when 'card-timeout' is
non-zero in /etc/poldi/scdaemon.conf the card should be powered down
after the next timer tick. This doesn't seem to work: I can lock my X
session, then unlock it without the pin of the card. I am using
xlockmore as the screen locker.

The attached patch fixes things by sending KILLSCD to scdaemon when
'killscd' is set in /etc/poldi/poldi.conf.

-- 
Ben Kibbey
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