Remove code reliant on bdist_wininst. Ref #3525.

newsfragments/3525.feature.rst

@@ -0,0 +1 @@
+Removed code referencing bdist_wininst in install_scripts.

setuptools/command/install_scripts.py

@@ -1,6 +1,5 @@
 from distutils import log
 import distutils.command.install_scripts as orig
-from distutils.errors import DistutilsModuleError
 import os
 import sys
 
@@ -37,15 +36,7 @@ def _install_ep_scripts(self):
         )
         bs_cmd = self.get_finalized_command('build_scripts')
         exec_param = getattr(bs_cmd, 'executable', None)
-        try:
-            bw_cmd = self.get_finalized_command("bdist_wininst")
-            is_wininst = getattr(bw_cmd, '_is_running', False)
-        except (ImportError, DistutilsModuleError):
-            is_wininst = False
         writer = ei.ScriptWriter
-        if is_wininst:
-            exec_param = "python.exe"
-            writer = ei.WindowsScriptWriter
         if exec_param == sys.executable:
             # In case the path to the Python executable contains a space, wrap
             # it so it's not split up.