also use openssl envvars to find certs on windows (closes #22449)

Patch by Christian Heimes and Alex Gaynor.
diff --git a/Lib/ssl.py b/Lib/ssl.py
index d3c18ed..d9d1916 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -390,8 +390,7 @@
         if sys.platform == "win32":
             for storename in self._windows_cert_stores:
                 self._load_windows_store_certs(storename, purpose)
-        else:
-            self.set_default_verify_paths()
+        self.set_default_verify_paths()
 
 
 def create_default_context(purpose=Purpose.SERVER_AUTH, *, cafile=None,