message: Fix extra semicolon warning
diff: #define CAF_MSG_TYPE_ADD_ATOM(name) \
  struct name {}; \
  - constexpr name name##_v = name{}; \
  template <class Inspector> \
  auto inspect(Inspector& f, name&) { \
  return f(meta::type_name("caf::" #name)); \
  + } \
  + constexpr name name##_v = name { \
  }
  namespace caf {
  