D19903: Fix build with msvc

[Hannah von Reth]

vonreth added a comment.


  So then the workaround is correct, I haven't tried whether the original code compiles with CMAKE_CXX_STANDARD=17

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REVISION DETAIL
  https://phabricator.kde.org/D19903

To: vonreth, mlaurent, davidedmundson, aacid
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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