Remove accidentally readded CMakeLists.txt
Placemark and RouteSimulationPositionProviderPlugins had been made
built-in in cd412cb457108b7ce6d7a6e8aeda71bb18c7e12e
The squashed "Port to KDE Frameworks 5" commit accidentally then
readded the CMakeLists.txt again in cf1158852b8905d2c22d68c139aa4f0935207844