D19958: Include QIcon header to fully declare type.

[Albert Astals Cid]

aacid removed reviewers: KDE Applications, KDE Games.

REPOSITORY
  R431 Simon

REVISION DETAIL
  https://phabricator.kde.org/D19958

To: luc4, #kde_applications, #kde_games
Cc: aacid, ngraham, fux, kde-speech, chenhui
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