tests/import_long_dyn: Test for "import *" of a long dynamic name.

Such names aren't stored as qstr in module dict, and there was a bug in
"import *" handling which assumed any name in a module dict is a qstr.

tests/import/import_long_dyn.py

+from import_long_dyn2 import *

tests/import/import_long_dyn2.py

+globals()["long_long_very_long_long_name"] = 1