Restore ScriptWriter and sys_executable properties.

Fixes #4976

Author: jaraco

setuptools/command/easy_install.py

@@ -1,5 +1,14 @@
+import os
+import sys
+
 from setuptools import Command
 
+from .. import _scripts
+
 
 class easy_install(Command):
     """Stubbed command for temporary pbr compatibility."""
+
+
+ScriptWriter = _scripts.ScriptWriter
+sys_executable = os.environ.get("__PYVENV_LAUNCHER__", os.path.normpath(sys.executable))

setuptools/tests/integration/test_pbr.py

@@ -1,9 +1,6 @@
 import subprocess
 
-import pytest
 
-
-@pytest.mark.xfail(reason="#4976")
 def test_pbr_integration(pbr_package, venv):
     """Ensure pbr packages install."""
     cmd = [