Import libfido2 1.8.0

* Version 1.8.0 (2021-07-22)
** Dropped 'Requires.private' entry from pkg-config file.
** Better support for FIDO 2.1 authenticators.
** Support for Windows's native webauth

Import libfido2 1.8.0

* Version 1.8.0 (2021-07-22)
** Dropped 'Requires.private' entry from pkg-config file.
** Better support for FIDO 2.1 authenticators.
** Support for Windows's native webauthn API.
** Support for attestation format 'none'.
** New API calls:
- fido_assert_set_clientdata;
- fido_cbor_info_algorithm_cose;
- fido_cbor_info_algorithm_count;
- fido_cbor_info_algorithm_type;
- fido_cbor_info_transports_len;
- fido_cbor_info_transports_ptr;
- fido_cred_set_clientdata;
- fido_cred_set_id;
- fido_credman_set_dev_rk;
- fido_dev_is_winhello.
** fido2-token: new -Sc option to update a resident credential.
** Documentation and reliability fixes.
** HID access serialisation on Linux.

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Import libfido2 1.7.0; changes:

Version 1.7.0 (2021-03-29)
- New dependency on zlib.
- Fixed musl build; gh#259.
- hid_win: detect devices with vendor or product IDs > 0x7fff; gh#264.
- Support for

Import libfido2 1.7.0; changes:

Version 1.7.0 (2021-03-29)
- New dependency on zlib.
- Fixed musl build; gh#259.
- hid_win: detect devices with vendor or product IDs > 0x7fff; gh#264.
- Support for FIDO 2.1 authenticator configuration.
- Support for FIDO 2.1 UV token permissions.
- Support for FIDO 2.1 "credBlobs" and "largeBlobs" extensions.
- New API calls:
fido_assert_blob_len;
fido_assert_blob_ptr;
fido_assert_largeblob_key_len;
fido_assert_largeblob_key_ptr;
fido_assert_set_hmac_secret;
fido_cbor_info_maxcredbloblen;
fido_cred_largeblob_key_len;
fido_cred_largeblob_key_ptr;
fido_cred_set_blob;
fido_dev_enable_entattest;
fido_dev_force_pin_change;
fido_dev_has_uv;
fido_dev_largeblob_get;
fido_dev_largeblob_get_array;
fido_dev_largeblob_remove;
fido_dev_largeblob_set;
fido_dev_largeblob_set_array;
fido_dev_set_pin_minlen;
fido_dev_set_sigmask;
fido_dev_supports_credman;
fido_dev_supports_permissions;
fido_dev_supports_uv;
fido_dev_toggle_always_uv.
- New fido_init flag to disable fido_dev_open's U2F fallback; gh#282.
- Experimental NFC support on Linux; enable with -DNFC_LINUX.

Version 1.6.0 (2020-12-22)
- Fix OpenSSL 1.0 and Cygwin builds.
- hid_linux: fix build on 32-bit systems.
- hid_osx: allow reads from spawned threads.
- Documentation and reliability fixes.
- New API calls:
fido_cred_authdata_raw_len;
fido_cred_authdata_raw_ptr;
fido_cred_sigcount;
fido_dev_get_uv_retry_count;
fido_dev_supports_credman.
- Hardened Windows build.
- Native FreeBSD and NetBSD support.
- Use CTAP2 canonical CBOR when combining hmac-secret and credProtect.

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Import Yubico's libfido2 from https://github.com/Yubico/libfido2.git