D19506: ECMGeneratePkgConfigFile: add variables used by pkg_check_modules

[David Faure]

dfaure closed this revision.

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