D24663: Use ECMGenerateExportHeader to manage deprecated API better

[Vlad Zahorodnii]

zzag edited reviewers, added: KWin; removed: Plasma.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D24663

To: kossebau, #kwin, #plasma
Cc: zzag, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns