D11617: Fix rcc packages generation

[Aleix Pol Gonzalez]

apol created this revision.
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Restricted Application added a project: Frameworks.
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REVISION SUMMARY
  Show an error when it doesn't succeed.
  Don't use a generator expression for the rcc file, cmake isn't smart enough to
  forward it, use a cache variable instead.

REPOSITORY
  R290 KPackage

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11617

AFFECTED FILES
  KF5PackageMacros.cmake

To: apol, #frameworks
Cc: michaelh, ngraham
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