D19859: Fix undefined behavior and set QT_MIN_VERSION to 5.9.0

[Kurt Hindenburg]

hindenburg accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R319 Konsole

BRANCH
  arc/Fix-undefined-behavior-and-set-QT_MIN_VERSION-to-5.9.0 (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D19859

To: mglb, #konsole, hindenburg
Cc: hindenburg, konsole-devel, gennad, maciejn, thsurrel, ngraham, maximilianocuria
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