sage_setup.command.build_ext: Use class from setuptools.command instead of distutils.command

Author: Matthias Koeppe

src/sage_setup/command/sage_build_ext.py

@@ -6,7 +6,7 @@
 import setuptools
 
 from distutils import log
-from distutils.command.build_ext import build_ext
+from setuptools.command.build_ext import build_ext
 from distutils.dep_util import newer_group
 from distutils.errors import DistutilsSetupError
 from sage_setup.run_parallel import execute_list_of_commands