D13914: Avoid compiler warnings for taglib headers

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added a reviewer: mgallien.
Restricted Application added projects: Frameworks, Baloo.
Restricted Application added subscribers: Baloo, kde-frameworks-devel.
kossebau requested review of this revision.

REVISION SUMMARY
  Declaring them as system headers (-> -isystem) tells the compiler
  we cannot do anything about them, so it stays silent for them.
  
  Completes b680861aa2ed973eb6694a9dda1c327107323062 <https://phabricator.kde.org/R286:b680861aa2ed973eb6694a9dda1c327107323062>

TEST PLAN
  Still builds and installs, but no longer warns about issues in taglib
  headers.

REPOSITORY
  R286 KFileMetaData

BRANCH
  avoidtaglibheaderwarnings

REVISION DETAIL
  https://phabricator.kde.org/D13914

AFFECTED FILES
  autotests/CMakeLists.txt
  src/CMakeLists.txt
  src/writers/CMakeLists.txt

To: kossebau, mgallien
Cc: kde-frameworks-devel, #baloo, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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