D17718: Use ECMGeneratePkgConfigFile to create the pkgconfig file.

[Christophe Giboudeaux]

cgiboudeaux added reviewers: cfeck, Build System.

REPOSITORY
  R6 KActivities

REVISION DETAIL
  https://phabricator.kde.org/D17718

To: cgiboudeaux, cfeck, #build_system
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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