D16894: [ECM] use a macro to add compiler flags conditionally

[René J.V. Bertin]

rjvbb set the repository for this revision to R240 Extra CMake Modules.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D16894

To: rjvbb, #build_system, kfunk
Cc: kfunk, apol, kde-frameworks-devel, kde-buildsystem, #build_system, michaelh, ngraham, bruns
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