applicationDirPath technically is already part of libraryPaths BUT it's
position isn't specified and as it turns out is in fact last and not first.
this has the unfortunate side effect that when trying to test a KIO
slave from the cmake build directory it would not get loaded unless it
isn't available in the system path.
to ensure slaves are loaded preferably relative to the applicationDirPath
we'll force-prepend the path to applicationDirPath