Log Message:
gnutls: Update to 3.7.0

* Version 3.7.0 (released 2020-12-02)

** libgnutls: Depend on nettle 3.6 (!1322).

** libgnutls: Added a new API that provides a callback function to
   retrieve missing certificates from incomplete certificate chains
   (#202, #968, #1100).

** libgnutls: Added a new API that provides a callback function to
   output the complete path to the trusted root during certificate
   chain verification (#1012).

** libgnutls: OIDs exposed as gnutls_datum_t no longer account for the
   terminating null bytes, while the data field is null terminated.
   The affected API functions are: gnutls_ocsp_req_get_extension,
   gnutls_ocsp_resp_get_response, and gnutls_ocsp_resp_get_extension
   (#805).

** libgnutls: Added a new set of API to enable QUIC implementation (#826, #849,
   #850).

** libgnutls: The crypto implementation override APIs deprecated in 3.6.9 are
   now no-op (#790).

** libgnutls: Added MAGMA/KUZNYECHIK CTR-ACPKM and CMAC support (!1161).

** libgnutls: Support for padlock has been fixed to make it work with Zhaoxin
   CPU (#1079).

** libgnutls: The maximum PIN length for PKCS #11 has been increased from 31
   bytes to 255 bytes (#932).

** API and ABI modifications:
gnutls_x509_trust_list_set_getissuer_function: Added
gnutls_x509_trust_list_get_ptr: Added
gnutls_x509_trust_list_set_ptr: Added
gnutls_session_set_verify_output_function: Added
gnutls_record_encryption_level_t: New enum
gnutls_handshake_read_func: New callback type
gnutls_handshake_set_read_function: New function
gnutls_handshake_write: New function
gnutls_handshake_secret_func: New callback type
gnutls_handshake_set_secret_function: New function
gnutls_alert_read_func: New callback type
gnutls_alert_set_read_function: New function
gnutls_crypto_register_cipher: Deprecated; no-op
gnutls_crypto_register_aead_cipher: Deprecated; no-op
gnutls_crypto_register_mac: Deprecated; no-op
gnutls_crypto_register_digest: Deprecated; no-op