Ignore annotated functions in other modules

Attrs package (which is used by pytest) added
type annotations to their stuff.
python-attrs/attrs#363

hintcheck_test.py

@@ -383,7 +383,7 @@ def test_locate_all_functions_that_need_hintcheck():
  fs = {
  f.function
  for f in locate_all_functions_that_need_hintcheck()
- if f.function.__module__ != '__main__'}
+ if f.function.__module__ == 'hintcheck_test'}
  for q in fs:
  print(q, q.__module__)
  assert fs == {f, C.m, C.p.fget, C.rw.fget, C.rw.fset}