D23006: [webenginepart] Fix build with cmake < 3.7

[Albert Astals Cid]

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

REPOSITORY
  R226 Konqueror

REVISION DETAIL
  https://phabricator.kde.org/D23006

To: wbauer, #konqueror, aacid
Cc: #kde_applications, #konqueror, rrosch, domson, demsking
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