New formula: pkcs11-helper

pkcs11-helper is a library that simplifies the interaction with PKCS#11
providers for end-user applications using a simple API and optional
OpenSSL engine.

pkcs11-helper allows using multiple PKCS#11 providers at the same time,
enumerating available token certificates, or selecting a certificate
directly by serialized id, handling card removal and card insert events,
handling card re-insert to a different slot, supporting session
expiration and much more all using a simple API.

Project website:
https://www.opensc-project.org/opensc/wiki/pkcs11-helper

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
New formula: gnupg-pkcs11-scd

gnupg-pkcs11 is a project to implement a BSD-licensed smart-card daemon
to enable the use of PKCS#11 tokens with GnuPG. gnupg-pkcs11-scd is a
drop-in replacement for the smart-card daemon (scd) shipped with the
next-generation GnuPG (gnupg-2). The daemon interfaces to smart-cards by
using RSA Security Inc. PKCS#11 Cryptographic Token Interface
(Cryptoki).

Project website: http://gnupg-pkcs11.sourceforge.net

Closes #18446.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>