update libfido2 to 1.11.0, taking in just over a year of upstream
development. "looks ok" miod@ ok sthen@

NB. libfido2 major bump

update to libfido2 1.8.0; ok sthen@ "timing is fine" deraadt@

update to upstream libfido2 780ad3c25 (20120123)

install manual pages

crank major

feedback & ok jmc@ and naddy@

Sync documentation fixes from upstream:

commit 99c4cb00b50b846e4ba2492f67d44171de8c7066
Author: pedro martelletto <pedro@yubico.com>
Date: Mon Nov 18 16:55:37 2019 +0100

documentation fixes

Sync documentation fixes from upstream:

commit 99c4cb00b50b846e4ba2492f67d44171de8c7066
Author: pedro martelletto <pedro@yubico.com>
Date: Mon Nov 18 16:55:37 2019 +0100

documentation fixes

ensure man pages are named after existing functions; pointed out
by Jason McIntyre <jmc@openbsd.org>; thanks!

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