D8069: Fix build with Qt 5.10

[Fabian Vogt]

fvogt created this revision.
fvogt added reviewers: Frameworks, graesslin.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  QByteArray does not include QString anymore, but that is needed in
  kxerrorhandler.cpp due to usage of operator overloads.

TEST PLAN
  Did not build before, now builds.

REPOSITORY
  R278 KWindowSystem

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8069

AFFECTED FILES
  src/platforms/xcb/kxerrorhandler.cpp

To: fvogt, #frameworks, graesslin
Cc: #frameworks
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