[Bug 1709193] [NEW] Unable to use TLSv1.1 or 1.2 with OpenSSL compat layer

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sSMTP is limited to using TLSv1.0 and the "old" ciphers that come with
it. Here's a packet capture when ssmtp connects to smtp.sdeziel.info:587
that offers TLSv1.0 and higher:

$ tshark -ta -Vr submission.pcap | sed -n '/^Frame 14:/,/^Frame 15:/ p' | grep -E '^[[:space:]]+(Version|Cipher|Handshake Protocol)'
        Version: TLS 1.0 (0x0301)
        Handshake Protocol: Client Hello
            Version: TLS 1.0 (0x0301)
            Cipher Suites Length: 30
            Cipher Suites (15 suites)
                Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
                Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA (0x0035)
                Cipher Suite: TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0041)
                Cipher Suite: TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0084)
                Cipher Suite: TLS_RSA_WITH_3DES_EDE_CBC_SHA (0x000a)
                Cipher Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x0033)
                Cipher Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x0039)
                Cipher Suite: TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (0x0045)
                Cipher Suite: TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (0x0088)
                Cipher Suite: TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA (0x0016)
                Cipher Suite: TLS_DHE_DSS_WITH_AES_128_CBC_SHA (0x0032)
                Cipher Suite: TLS_DHE_DSS_WITH_AES_256_CBC_SHA (0x0038)
                Cipher Suite: TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA (0x0044)
                Cipher Suite: TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA (0x0087)
                Cipher Suite: TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA (0x0013)

I would expect ssmtp to use TLSv1.2 and a recent cipher like the openssl
s_client is able to do:

$ echo | openssl s_client -connect smtp.sdeziel.info:587 -starttls smtp 2>/dev/null | grep -E '^[[:space:]]+(Protocol|Cipher)'
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES128-GCM-SHA256


Additional information:

$ lsb_release -rd
Description:	Ubuntu 16.04.3 LTS
Release:	16.04
$ apt-cache policy ssmtp libgnutls-openssl27
ssmtp:
  Installed: 2.64-8ubuntu1
  Candidate: 2.64-8ubuntu1
  Version table:
 *** 2.64-8ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status
libgnutls-openssl27:
  Installed: 3.4.10-4ubuntu1.3
  Candidate: 3.4.10-4ubuntu1.3
  Version table:
 *** 3.4.10-4ubuntu1.3 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     3.4.10-4ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ssmtp 2.64-8ubuntu1 [modified: etc/ssmtp/revaliases]
ProcVersionSignature: Ubuntu 4.4.0-89.112-generic 4.4.76
Uname: Linux 4.4.0-89-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Mon Aug  7 18:13:33 2017
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ssmtp
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.ssmtp.revaliases: [modified]
mtime.conffile..etc.ssmtp.revaliases: 2017-08-05T13:44:06.274302

** Affects: gnutls28 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ssmtp (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: gnutls28 (Debian)
     Importance: Unknown
         Status: Unknown


** Tags: amd64 apport-bug patch xenial
-- 
Unable to use TLSv1.1 or 1.2 with OpenSSL compat layer
https://bugs.launchpad.net/bugs/1709193
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