D8533: Fix build with BUILD_TESTING turned off

[Bhushan Shah]

bshah created this revision.
bshah added a reviewer: Plasma.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Without this it fails to build, as that variable is not exported anywhere else

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8533

AFFECTED FILES
  containments/desktop/plugins/folder/folderplugin_private_export.h

To: bshah, #plasma
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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