bpo-43749: Ensure current exe is copied when using venv on windows (pythonGH-25216)

Automerge-Triggered-By: GH:vsajip
(cherry picked from commit 5d6e463)

Co-authored-by: Ian Norton <inorton@gmail.com>

Author: inorton

Lib/venv/__init__.py

@@ -281,8 +281,9 @@ def setup_python(self, context):
                         os.path.normcase(f).startswith(('python', 'vcruntime'))
                     ]
             else:
-                suffixes = ['python.exe', 'python_d.exe', 'pythonw.exe',
-                            'pythonw_d.exe']
+                suffixes = {'python.exe', 'python_d.exe', 'pythonw.exe', 'pythonw_d.exe'}
+                base_exe = os.path.basename(context.env_exe)
+                suffixes.add(base_exe)
 
             for suffix in suffixes:
                 src = os.path.join(dirname, suffix)