since Plasma_INCLUDE_DIR doesn't seem to be used anywhere and fails on CI
experiment with removing it, to see if all packages depending from plasma
build
Change-Id: I1b8f99b0d7e9de2f33674646e273f141646eaeb2
Plasma::Package internally uses KPackage, being a pure wrapper.
old client code and old packagestructures still work using the wrapper.
old workspace code that is not directly using kpackage continues to work correctly
Change-Id: I05f95e8d05e3b67759973c4009e3753c61b1dcce