testing/elf_diff: fix missing dep
py3-setuptools is actually a runtime dep, not just a makedep. This fixes:
$ elf_diff --help
Traceback (most recent call last):
File "/usr/bin/elf_diff", line 3, in <module>
from elf_diff.__main__ import main
File "/usr/lib/python3.12/site-packages/elf_diff/__main__.py", line 23, in <module>
from elf_diff.pair_report_document import generateDocument, ValueTreeNode
File "/usr/lib/python3.12/site-packages/elf_diff/pair_report_document.py", line 36, in <module>
from elf_diff.binary_pair import BinaryPair, BinaryPairSettings
File "/usr/lib/python3.12/site-packages/elf_diff/binary_pair.py", line 24, in <module>
from elf_diff.auxiliary import setIntersection
File "/usr/lib/python3.12/site-packages/elf_diff/auxiliary.py", line 24, in <module>
from distutils import dir_util
ModuleNotFoundError: No module named 'distutils'