message: cmake/version: fix multiple includes of version.h
  This fixes error during linking. Error was multiple redefinitions of
  functions from version.h.
diff: #define SERVER_VERSION "@VERSION_SERVER@"
  namespace aditof {
  - const std::string getApiVersion() { return std::string(ADITOF_API_VERSION); }
  - const std::string getUvcVersion() { return std::string(UVC_GADGET_VERSION); }
  - const std::string getServerVersion() { return std::string(SERVER_VERSION); }
  + static inline const std::string getApiVersion() { return std::string(ADITOF_API_VERSION); }
  + static inline const std::string getUvcVersion() { return std::string(UVC_GADGET_VERSION); }
  + static inline const std::string getServerVersion() { return std::string(SERVER_VERSION); }
  } // namespace aditof
  