message: force legion to use python3
diff: @@ -18,6 +18,7 @@ if(FF_USE_EXTERNAL_LEGION)
  else()
  if(FF_USE_PYTHON)
  set(Legion_USE_Python ON CACHE BOOL "enable Legion_USE_Python")
  + set(Legion_Python_Version "3.8" CACHE STRING "Minimum Python version")
  endif()
  if(FF_USE_GASNET)
  set(Legion_EMBED_GASNet ON CACHE BOOL "Use embed GASNet")
  