get_pin for scard-opensc.c

[Kevin Stefanik]

I'm attaching a patch to allow ssh client to get a pin from the command line 
when using a smartcard.  Most of it is from a patch by Danny De Cock 
<godot () ulyssis ! org>, but I've used the ssh read_passphrase function 
instead.  Any errors are mine, I'm sure.

This enables ssh -I 0 to use a pin-protected smartcard via opensc.

Thanks,
Kevin Stefanik
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