[5.1.x] Migrated setuptools configuration to pyproject.toml.

This branch migrates setuptools configuration from setup.py/setup.cfg to
pyproject.toml. In order to ensure that the generated binary files have
consistent casing (both the tarball and the wheel), setuptools version
is limited to ">=61.0.0,<69.3.0".

Configuration for flake8 was moved to a dedicated .flake8 file since
it cannot be configured via pyproject.toml.

Also, __pycache__ exclusion was removed from MANIFEST and the
extras/Makefile was replaced with a simpler build command.

Co-authored-by: Nick Pope <nick@nickpope.me.uk>

Backport of 4686541691dbe986f58ac87630c3b7a04db4ff93 from main.

1 files changed, 0 insertions, 55 deletions

diff --git a/setup.py b/setup.py
deleted file mode 100644
index ef91130d47..0000000000
--- a/setup.py
+++ /dev/null
@@ -1,55 +0,0 @@
-import os
-import site
-import sys
-from distutils.sysconfig import get_python_lib
-
-from setuptools import setup
-
-# Allow editable install into user site directory.
-# See https://github.com/pypa/pip/issues/7953.
-site.ENABLE_USER_SITE = "--user" in sys.argv[1:]
-
-# Warn if we are installing over top of an existing installation. This can
-# cause issues where files that were deleted from a more recent Django are
-# still present in site-packages. See #18115.
-overlay_warning = False
-if "install" in sys.argv:
-    lib_paths = [get_python_lib()]
-    if lib_paths[0].startswith("/usr/lib/"):
-        # We have to try also with an explicit prefix of /usr/local in order to
-        # catch Debian's custom user site-packages directory.
-        lib_paths.append(get_python_lib(prefix="/usr/local"))
-    for lib_path in lib_paths:
-        existing_path = os.path.abspath(os.path.join(lib_path, "django"))
-        if os.path.exists(existing_path):
-            # We note the need for the warning here, but present it after the
-            # command is run, so it's more likely to be seen.
-            overlay_warning = True
-            break
-
-
-setup()
-
-
-if overlay_warning:
-    sys.stderr.write(
-        """
-
-========
-WARNING!
-========
-
-You have just installed Django over top of an existing
-installation, without removing it first. Because of this,
-your install may now include extraneous files from a
-previous version that have since been removed from
-Django. This is known to cause a variety of problems. You
-should manually remove the
-
-%(existing_path)s
-
-directory and re-install Django.
-
-"""
-        % {"existing_path": existing_path}
-    )