D11239: Fix build with Qt 5.11

[Antonio Rojas]

arojas created this revision.
arojas added reviewers: Amarok, heikobecker.
Restricted Application added a project: Amarok.
arojas requested review of this revision.

REVISION SUMMARY
  Explicitely add needed includes

TEST PLAN
  Builds with Qt 5.11

REPOSITORY
  R181 Amarok

REVISION DETAIL
  https://phabricator.kde.org/D11239

AFFECTED FILES
  src/aboutdialog/ExtendedAboutDialog.cpp

To: arojas, #amarok, heikobecker
Cc: nhuisman, paul, yaohanchen, malteveerman, markey, cochise, tbettler, Smar, ricktimmis, asturmlechner, schweingruber, heikobecker
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