Removing old card drivers from OpenSC

Many of the internal card drivers have not been updated in years (card-*.c
and their pkcs15-*.c counterpart). Although they may have gotten touched
due to general security fixes, these changes are mostly untested with these
card drivers. Most likely these cards are not in use anymore. To reduce the
overall attack surface, I am planning to remove the old card drivers first
by disabling them in the default configuration and later by removing them
from the default compilation process.

The rationale when and how to remove a card driver is given in the wiki:
https://github.com/OpenSC/OpenSC/wiki/Removal-of-Old-Card-Drivers.
Progress about the implementation is tracked on Github:
https://github.com/OpenSC/OpenSC/projects/2
A first implementation is available as pull request:
https://github.com/OpenSC/OpenSC/pull/1175

What I like to know, is wether you think the time scales are chosen
approprietly. Of course, if you think some driver needs to stay in the
default configuration or the default binaries, please update the wiki page
indicating that it is still used (and ideally, add a link as prove).

Thanks for your feedback!

Regards,
Frank.

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