Add back python2-setuptools

This adds back a python 2 version of setuptools but with all dependencies vendored
(the upstream default..). To allow users to install Python 2 packages we no longer
have in the repo etc which should help them transitioning.

This also adds conflicts between py2/3 setuptools because of the esy_install rename.

See #4993

mingw-w64-python2-setuptools/0001-mingw-python-fix.patch

@@ -0,0 +1,13 @@
+--- setuptools-5.4.1/setuptools/command/easy_install.py.orig	2014-02-11 21:11:57.898800000 +0400
++++ setuptools-5.4.1/setuptools/command/easy_install.py	2014-02-11 21:41:20.905000000 +0400
+@@ -1256,8 +1256,8 @@
+     )
+ 
+     DEFAULT_SCHEME = dict(
+-        install_dir='$base/Lib/site-packages',
+-        script_dir='$base/Scripts',
++        install_dir='$base/lib/python$py_version_short/site-packages',
++        script_dir='$base/bin',
+     )
+ 
+     def _expand(self, *attrs):