D6762: ECM: KDECompilerSettings LINKER_FLAGS on Cygwin

[Allen Winter]

winterz added reviewers: skelly, Build System.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D6762

To: winterz, skelly, #build_system
Cc: #frameworks, #build_system