message: Fix for newly imported Pythia8
diff: #include <list>
  // Stdlib header file for dynamic library loading.
  +#ifndef __CINT__
  #define dlsym __
  +#ifndef __const
  +#define __const const
  +#endif
  #include <dlfcn.h>
  #undef dlsym
  +#endif
  // Redefine dlsym to suppress compiler warnings.
  extern "C" void *(*dlsym(void *handle, const char *symbol))();
  