Log Message:
Update to GnuTLS 3.5.12.

Pkgsrc changes:
Adapt PLIST.

Upstream changes:

* Version 3.5.12 (released 2017-05-11)

** libgnutls: enabled TCP Fast open for MacOSX. Patch by Tim Ruehsen.

** libgnutls: gnutls_x509_crt_check_hostname2() no longer matches IP addresses
   against DNS fields of certificate (CN or DNSname). The previous behavior
   was to tolerate some misconfigured servers, but that was non-standard
   and skipped any IP constraints present in higher level certificates.

** libgnutls: when converting to IDNA2008, fallback to IDNA2003
   (i.e., transitional encoding) if the domain cannot be converted.
   That provides maximum compatibility with browsers like firefox
   that perform the same conversion.

** libgnutls: fix issue in RSA-PSK client callback which resulted
   in no username being sent to the peer. Patch by Nicolas Dufresne.

** libgnutls: fix regression causing stapled extensions in trust modules not
   to be considered.

** certtool: introduced the email_protection_key option.  This
   option was introduced in documentation for certtool without an
   implementation of it.  It is a shortcut for option 'key_purpose_oid
   = 1.3.6.1.5.5.7.3.4'.

** certtool: made printing of key ID and key PIN consistent between
   certificates, public keys, and private keys. That is the private
   key printing now uses the same format as the rest.

** gnutls-cli: introduced the --sni-hostname option. This allows overriding the
   hostname advertised to the peer.

** API and ABI modifications:
No changes since last version.

* Version 3.5.11 (released 2017-04-07)

** gnutls.pc: do not include libtool options into Libs.private.

** libgnutls: Fixed issue when rehandshaking without a client certificate in
   a session which initially used one. Reported by Frantisek Sumsal.

** libgnutls: Addressed read of 4 bytes past the end of buffer in OpenPGP
   certificate parsing. Issues found using oss-fuzz project and were fixed
   by Alex Gaynor:
   https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=737
   https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=824

** libgnutls: Introduced locks in gnutls_pkcs11_privkey_t structure access.
   That allows PKCS#11 operations such as signing to be performed with the
   same object from multiple threads.

** libgnutls: Added support for MacOSX key chain for obtaining
   trust store's root CA certificates. That is,
   gnutls_x509_trust_list_add_system_trust() and
   gnutls_certificate_set_x509_system_trust() will load the certificates
   from the key chain. That also means that we no longer check for a
   default trust store file in configure when building on MacOSX (unless
   explicitly asked to).  Patch by David Caldwell.

** libgnutls: when disabling OpenPGP authentication, the resulting library
   is ABI compatible (with openpgp related functions being stubs that fail
   on invocation).

** API and ABI modifications:
No changes since last version.

* Version 3.5.10 (released 2017-03-06)

** gnutls.pc: do not include libidn2 in Requires.private. The
   libidn2 versions available do not include libidn2.pc, thus the
   inclusion was causing pkg-config issues. Instead we include
   -lidn2 in Libs.private when compile against libidn2.

** libgnutls: optimized access to subject alternative names (SANs)
   in parsed certificates. The previous implementation assumed a
   small number of SANs in a certificate, with repeated calls to
   ASN.1 decoding of the extension without any intermediate caching.
   That caused delays in certificates with a long list of names in
   functions such as gnutls_x509_crt_check_hostname().  With the
   current code, the SANs are parsed once on certificate import.
   Resolves gitlab issue #165.

** libgnutls: Addressed integer overflow resulting to invalid memory
   write in OpenPGP certificate parsing. Issue found using oss-fuzz
   project:  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=420
   [GNUTLS-SA-2017-3A]

** libgnutls: Addressed read of 1 byte past the end of buffer in OpenPGP
   certificate parsing. Issue found using oss-fuzz project:
   https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=391

** libgnutls: Addressed crashes in OpenPGP certificate parsing, related
   to private key parser. No longer allow OpenPGP certificates (public keys)
   to contain private key sub-packets. Issue found using oss-fuzz project:
   https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=354
   https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=360 [GNUTLS-SA-2017-3B]

** libgnutls: Addressed large allocation in OpenPGP certificate parsing, that
   could lead in out-of-memory condition. Issue found using oss-fuzz project,
   and was fixed by Alex Gaynor:
   https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=392 [GNUTLS-SA-2017-3C]

** libgnutls: Print the key PIN value used by the HPKP protocol as per RFC7469
   when printing certificate information.

** libgnutls: gnutls_ocsp_resp_verify_direct() and gnutls_ocsp_resp_verify()
   flags can be set from the gnutls_certificate_verify_flags enumeration.
   This allows the functions to pass the same flags available for certificates
   to the verification function (e.g., GNUTLS_VERIFY_DISABLE_TIME_CHECKS or
   GNUTLS_VERIFY_ALLOW_BROKEN).

** libgnutls: gnutls_store_commitment() can accept flag
   GNUTLS_SCOMMIT_FLAG_ALLOW_BROKEN. This is to allow the function to operate
   in applications which use SHA1 for example, after SHA1 is deprecated.

** certtool: No longer ignore the 'add_critical_extension' template option if
   the 'add_extension' option is not present.

** gnutls-cli: Added LMTP, POP3, NNTP, Sieve and PostgreSQL support to the
   starttls-proto command. Patch by Robert Scheck.

** API and ABI modifications:
No changes since last version.