Make `import PIL; PIL.Image` work

[Kodiologist]

With Pillow 9.2.0 and (e.g.) matplotlib 3.5.2:

$ python3 -c 'import PIL; PIL.Image'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: module 'PIL' has no attribute 'Image'
$ python3 -c 'import matplotlib, PIL; PIL.Image'
# No error.

This behavior is quite strange.