D19939: Avoid failing installation via temporary dir due to file name clashes

[Friedrich W. H. Kossebau]

kossebau added a reviewer: apol.

REPOSITORY
  R304 KNewStuff

REVISION DETAIL
  https://phabricator.kde.org/D19939

To: kossebau, #frameworks, leinir, apol
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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