As part of commit
4d2ca2be49 ("package/python-setuptools:
bump to version 59.8.0 and split python2 version"), the
HOST_PYTHON_SETUPTOOLS_NEEDS_HOST_PYTHON was moved next to the other
HOST_* variables, but it was also re-added at the original location
during an (incorrect) review process. Fix that up by dropping the
duplicate definition.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>