D17479: Fix build without phonon

[Heiko Becker]

heikobecker created this revision.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
heikobecker requested review of this revision.

REVISION SUMMARY
  f6d55baf5aa88eaab6b2f96c025064f081d13cea <https://phabricator.kde.org/R305:f6d55baf5aa88eaab6b2f96c025064f081d13cea> replaced ${PHONON_LIBS} with
  Phonon's imported target. This breaks in the case when Phonon isn't
  found or disabled via -DCMAKE_DISABLE_FIND_PACKAGES_Phonon4Qt5=TRUE
  because the imported target isn't known. It worked previously because
  was ${PHONON_LIBS} just empty when Phonon wasn't available.

TEST PLAN
  Building without phonon works now and and it still builds
  with phonon available and successfully links to it.

REPOSITORY
  R305 KNotifyConfig

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17479

AFFECTED FILES
  src/CMakeLists.txt

To: heikobecker
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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