agent: Default to extended key format.
5b927b7b27bd
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Description

agent: Default to extended key format.

* agent/gpg-agent.c (oDisableExtendedKeyFormat, oNoop): New.
(opts): Make --enable-extended-key-format a dummy option.  Add
disable-extended-key-format.
(parse_rereadable_options): Implement oDisableExtendedKeyFormat.
* agent/protect.c (agent_protect): Be safe and set use_ocb either to
to 1 or 0.

Extended key format is supported since version 2.1.12 which should have
long been replaced by a newer version in all installations. Thus for
2.2.22 we will make use of the extended-key-format by default.

This is a backport of the commits:
05eff1f6623c272fcabd4e238842afc832710324
91ae3e7fb66271691f6fe507262a62fc7e2663a3