scd: Remove unused files.

[NIIBE Yutaka]

Hello,

I'm going to remove old historical unused files under SCD.

    * scd/Makefile.am (sc_copykeys_*): Remove.
    * scd/sc-copykeys.c: Remove.
    * scd/pcsc-wrapper.c: Remove.
    * scd/{card-common.h,card-dinsig.c,card-p15.c,card.c}: Remove.

    --

    sc-copykeys doesn't work any more because it's based on old API.
    pcsc-wrapper has gone because of nPth which is compatible to pthreads.
    The card* files are old files, now we have app*.

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