- *.m4 update for all software of GnuPG (from libgpg-error up to gpg, and gpa, scute, poldi).
- triggered by gnulib change
- Fixed scdaemon bug in 2.2: rG84020385be19: scd:openpgp: Public keys should be available for check_keyidstr.
- Experiment on T5137: gpg-agent 2.x poor performance / futex errors
- Consider about CARDNO on T5100: OpenPGP app overwrites Yubikey serial number