CMake: Remove statement that has no effect

Change-Id: I3e1494165a77ea76c83d45f2bb08f2a87cd68436
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
CMake: Pass some values by reference

Change-Id: Ie232a4312a783f41cb719e6a69cd2e3006caf84c
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
GenericProjectManager: Pass string by reference

Change-Id: I4eb8ecbf477764b780c1ef76c179af550e3952d3
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
QtSupport: Pass const value by reference

Change-Id: Ibb99ad400a7be9942924abe369c6088be98ad9ec
Reviewed-by: Daniel Teske <daniel.teske@digia.com>