D22580: Notify users when not using KDE_INSTALL_USE_QT_SYS_PATHS about prefix.sh

[Christophe Giboudeaux]

cgiboudeaux accepted this revision.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22580

To: apol, #frameworks, albertvaka, cgiboudeaux
Cc: cgiboudeaux, albertvaka, kde-frameworks-devel, kde-buildsystem, LeGast00n, 
sbergeron, bencreasy, michaelh, ngraham, bruns