D12674: Mark `Phonon4Qt5` dependency as optional in CMakeLists file

[Alexander Schlarb]

tundracomp set the repository for this revision to R289 KNotifications.
Restricted Application edited subscribers, added: kde-frameworks-devel; removed: Frameworks.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D12674

To: tundracomp
Cc: kde-frameworks-devel, apol, ltoscano, cgiboudeaux, michaelh, ngraham, bruns, #frameworks
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