FIX: Configure failed because of misplaced library pathes

We've had library paths in CMake's `add_executable` and `add_library` directives. These libraries have to be built by `make` and are therefore not present at configure-time. Obviously older CMake versions complain about that...

This removes the library paths that do not belong there anyway. The dependencies were already correctly specified using `add_dependency` and `target_link_library`