Starting with version 1.12.0, libgcrypt was failing to validate
Curve25519 secret keys on FreeBSD-main. This resulted in failures such
as in the example below. Incorporate the patch from
https://dev.gnupg.org/T8094 to fix the problem.
% TEMP_GPG=$(mktemp -d)
% GNUPGHOME=$TEMP_GPG gpg --batch --import < ./test/openpgp4-secret-key.asc
gpg: keybox '/tmp/tmp.gkqFaMAlVu/pubring.kbx' created
gpg: /tmp/tmp.gkqFaMAlVu/trustdb.gpg: trustdb created
gpg: key 7E6ABE924645CC60: public key "Notmuch Test Suite (INSECURE!) <test_suite@notmuchmail.org>" imported
gpg: key 7E6ABE924645CC60: secret key imported
gpg: Total number processed: 1
gpg: imported: 1
gpg: secret keys read: 1
gpg: secret keys imported: 1
% GNUPGHOME=$TEMP_GPG gpg --decrypt ./test/corpora/crypto/basic-encrypted.eml
gpg: encrypted with cv25519 key, ID 1D71CFF38F6B48AF, created 2022-09-07
"Notmuch Test Suite (INSECURE!) <test_suite@notmuchmail.org>"
gpg: public key decryption failed: Bad secret key
gpg: decryption failed: Bad secret key
Approved by: cy (maintainer)
Obtained from: https://dev.gnupg.org/T8094
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D55280
be18d9f77a