Please backport libsmbios 2.4.0-1 (main) from bionic-proposed

[Mario Limonciello]

Please backport libsmbios 2.4.0-1 (main) from bionic to trusty, xenial.

Reason for the backport:
========================
Many platforms have adopted SMBIOS 3.0 tables and can't work properly with the functionality
in current version of libsmbios.

libsmbios also has some memory leaks that are exercised in error scenarios as a result.

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
Test builds available at ppa:superm1/libsmbios

* trusty:
[-] Package builds without modification
    Package needs minor modification in packaging to use debhelper 9 instead of 10.
    No other changes needed.
See https://launchpadlibrarian.net/356424571/libsmbios_2.4.0-1~ubuntu14.04.1~ppa1_2.4.0-1~ubuntu14.04.1~ppa2.diff.gz for diff
[x] smbios-utils installs cleanly and runs
[x] libsmbios-doc installs cleanly and runs
[x] libsmbios-c2-dbgsym installs cleanly and runs
[x] python3-libsmbios installs cleanly and runs
[x] libsmbios-dev installs cleanly and runs
[x] libsmbios-c2 installs cleanly and runs
[x] smbios-utils-dbgsym installs cleanly and runs
* xenial:
[x] Package builds without modification
[x] smbios-utils installs cleanly and runs
[x] libsmbios-doc installs cleanly and runs
[x] libsmbios-c2-dbgsym installs cleanly and runs
[x] python3-libsmbios installs cleanly and runs
[x] libsmbios-dev installs cleanly and runs
[x] libsmbios-c2 installs cleanly and runs
[x] smbios-utils-dbgsym installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of libsmbios. For reverse-build-dependencies (-Indep), please test that the package still builds against the new libsmbios. For reverse-dependencies, please test that the version of the package currently in the release still works with the new libsmbios installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

smbios-utils
------------
* firmware-addon-dell
  [x] trusty (Reverse-Depends)
  [x] xenial (Reverse-Depends)

libsmbios-doc
-------------
* libsmbios2
  [-] trusty (Reverse-Suggests)
* libsmbios2v5
  [-] xenial (Reverse-Suggests)
* python-libsmbios
  [-] trusty (Reverse-Suggests)
  [-] xenial (Reverse-Suggests)
N/A, these are not installed any more

libsmbios-c2-dbgsym
-------------------

python3-libsmbios
-----------------

libsmbios-dev
-------------

libsmbios-c2
------------

smbios-utils-dbgsym
-------------------