Merge remote-tracking branch 'origin/master' into macos-universal2

# Conflicts:
#	bin/sample_build.py
#	cibuildwheel/__main__.py
#	cibuildwheel/macos.py
#	cibuildwheel/util.py
#	cibuildwheel/windows.py

bin/sample_build.py

@@ -22,4 +22,4 @@ if __name__ == '__main__':
         options.project_python_path, project_dir
     ], check=True)
 
-    exit(subprocess.run([sys.executable, '-m', 'cibuildwheel'], cwd=project_dir).returncode)
+    sys.exit(subprocess.run([sys.executable, '-m', 'cibuildwheel'], cwd=project_dir).returncode)