Log Message:
Add security/uacme package.

Lightweight client for the RFC8555 ACMEv2 protocol, written in plain C
with minimal dependencies (libcurl and one of GnuTLS, OpenSSL or mbedTLS).

The ACMEv2 protocol allows a Certificate Authority (Let's Encrypt is a
popular one) and an applicant to automate the process of verification
and certificate issuance.  The protocol also provides facilities for
other certificate management functions, such as certificate revocation.