sage_setup: Import setuptools before importing distutils, so that setuptools can replace distutils by its own vendored copy

Author: Matthias Koeppe

src/sage_setup/command/sage_build.py

@@ -1,3 +1,7 @@
+# Import setuptools before importing distutils, so that setuptools
+# can replace distutils by its own vendored copy.
+import setuptools
+
 from distutils import log
 from distutils.command.build import build
 

src/sage_setup/command/sage_build_cython.py

@@ -8,6 +8,11 @@
 import sys
 import time
 import json
+
+# Import setuptools before importing distutils, so that setuptools
+# can replace distutils by its own vendored copy.
+import setuptools
+
 from distutils import log
 from setuptools import Command
 

src/sage_setup/command/sage_build_ext.py

@@ -1,5 +1,10 @@
 import os
 import errno
+
+# Import setuptools before importing distutils, so that setuptools
+# can replace distutils by its own vendored copy.
+import setuptools
+
 from distutils import log
 from distutils.command.build_ext import build_ext
 from distutils.dep_util import newer_group

src/sage_setup/command/sage_install.py

@@ -4,6 +4,11 @@
 
 import os
 import time
+
+# Import setuptools before importing distutils, so that setuptools
+# can replace distutils by its own vendored copy.
+import setuptools
+
 from distutils import log
 from distutils.command.install import install