package/python-setuptools: drop duplicate variable definition

As part of commit
4d2ca2be49fecb68a988662a27d31278408614d2 ("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>

package/python-setuptools/python-setuptools.mk

@@ -29,7 +29,6 @@ PYTHON_SETUPTOOLS_LICENSE_FILES = LICENSE
 PYTHON_SETUPTOOLS_CPE_ID_VENDOR = python
 PYTHON_SETUPTOOLS_CPE_ID_PRODUCT = setuptools
 PYTHON_SETUPTOOLS_SETUP_TYPE = setuptools
-HOST_PYTHON_SETUPTOOLS_NEEDS_HOST_PYTHON = python2
 
 ifeq ($(BR2_PACKAGE_PYTHON),y)
 define PYTHON_SETUPTOOLS_EXTRACT_CMDS