[sane-devel] [janitorial] Debian 9 CI builds added

[Olaf Meeuwissen]

Hi all,

I have been refactoring the way the Docker images for the CI jobs are
built and added support for Debian 9 which was released on 2017-06-17.

At present, the Debian 9 builds only test compilation and flag compiler
warnings.  They do not fail the build if there are any warnings, unlike
the builds for Debian 8.

I plan to "stamp out" warnings on *both* Debian versions, in the next
few weeks/months, but feel free to help out ;-)

# BTW, Fedora 26 is also nearing release, with gcc-7 ... curious what
# that'll bring.

Hope this helps,
--
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
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