D6634: Require C++14

[Martin Flöser]

graesslin added a reviewer: lbeltrame.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D6634

To: graesslin, #plasma, lbeltrame
Cc: plasma-devel, kwin, #kwin, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
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