Pillow fixes

There are two things I'm unsure about:

  1. The ``jpeg`` run requirement is unix only in the ``pillow`` yaml. Should it be unix only in the ``libtiff``?
  2. Does the ``pillow`` build number need bumping?

To summarise the fixes:

  1. Typo in ``libtiff`` name
  2. ``jpeg`` should be a run/build requirement for ``libtiff`` to prevent it from linking against the system ``jpeg``
  3. Latest ``pillow`` seems to have a multiprocess build system which doesn't seem to work on Windows, and doesn't really seem necessary anyway.
So if I just revert the bump, then what is your normal testing process for packages like these?