D17446: cmake macros: Port away from deprecated ECM var in kcoreaddons_add_plugin

[Elvis Angelaccio]

elvisangelaccio accepted this revision.

REPOSITORY
  R244 KCoreAddons

REVISION DETAIL
  https://phabricator.kde.org/D17446

To: mpyne, #frameworks, elvisangelaccio, apol, dfaure
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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