Replace FINAL_11 with final.

The changes to OpenSim/Wrapping/SWIGSimTK/common.h should be discussed. See some discussion over at simbody [here](https://github.com/simbody/simbody/pull/302/files#diff-ba43f68612864196b99e9cd542e95b73L239). This common.h file in simbody was just updated by @sherm1.


I believe that `override final` (while allowed) means the same thing as `final`. I would prefer to see just `final` here to avoid confusion.