D19506: ECMGeneratePkgConfigFile: add variables used by pkg_check_modules

[Christophe Giboudeaux]

cgiboudeaux requested changes to this revision.
This revision now requires changes to proceed.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D19506

To: dfaure, apol, fazevedo, cgiboudeaux
Cc: cgiboudeaux, fazevedo, kde-buildsystem, kde-frameworks-devel, michaelh, ngraham, bruns
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