security/gnupg: add the --shared-access option to scdaemon

[asomers]

Summary

security/gnupg: add the --shared-access option to scdaemon

gnupg's scdaemon opens smart cards in exclusive mode, which prevents other
applications (such as PKCS#11 libraries) from concurrently accessing the
card). Upstream refuses to fix the problem. This commit adds a
--shared-access option to scdaemon. When enabled, scdaemon will access the
smart card in shared mode, playing nicely with other applications. The
default behavior is unchanged.

See Also:
https://github.com/GPGTools/MacGPG2/commit/d6cb8039a0cdc74b9bdd89a3dfa93248aa2c4100
https://dev.gnupg.org/T3267
https://dev.gnupg.org/D320
https://github.com/OpenSC/OpenSC/issues/953

Obtained-from: GPGTools

[adamw]

I haven't tested this (I have no way of actually testing it), so I'm relying on you there. You definitely have my approval to commit this whenever you're ready.

[adamw]

I guess I should add to please make sure that make -C ${WRKSRC} check completes successfully.

[adamw]

What is the status of this patch? What help can I be of here? I'll hold off on updating to 2.2.18 (just released) so as not to interfere here.

[asomers]

It's ready to go, but I had one more question at https://reviews.freebsd.org/D22492 . I was waiting for your answer, not because it's strictly required but just in case you had something surprising to say.