setup.py: drop include_package_data=True

this disables the automatism that looks up data files/directories, which
we don't need as we are explicitly listing them already and it is now
causing a warning at build time

Closes: #336
Signed-off-by: Mattia Rizzolo <mattia@debian.org>

setup.py

@@ -50,7 +50,6 @@ setup(
     url="https://diffoscope.org/",
     packages=find_packages(exclude=["tests", "tests.*"]),
     package_data={"diffoscope": ["scripts/*"]},
-    include_package_data=True,
     tests_require=["pytest"],
     cmdclass={"test": PyTest},
     entry_points={