Revert "bpo-35239: _PySys_EndInit() copies module_search_path (GH-10532)" (GH-10660)

This reverts commit d2be9a5c13221fb84c2221bbfd93efac6111e697.
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 7eaf376..86f95de 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -967,8 +967,8 @@
     }
 
     /* Initialize warnings. */
-    PyObject *warnoptions = PySys_GetObject("warnoptions");
-    if (warnoptions != NULL && PyList_Size(warnoptions) > 0)
+    if (interp->config.warnoptions != NULL &&
+        PyList_Size(interp->config.warnoptions) > 0)
     {
         PyObject *warnings_module = PyImport_ImportModule("warnings");
         if (warnings_module == NULL) {
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 48d8fa4..498fa91 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -2464,20 +2464,7 @@
     assert(config->exec_prefix != NULL);
     assert(config->base_exec_prefix != NULL);
 
-#define COPY_LIST(KEY, ATTR) \
-    do { \
-        assert(PyList_Check(config->ATTR)); \
-        PyObject *list = PyList_GetSlice(config->ATTR, \
-                                         0, PyList_GET_SIZE(config->ATTR)); \
-        if (list == NULL) { \
-            return -1; \
-        } \
-        SET_SYS_FROM_STRING_BORROW(KEY, list); \
-        Py_DECREF(list); \
-    } while (0)
-
-    COPY_LIST("path", module_search_path);
-
+    SET_SYS_FROM_STRING_BORROW("path", config->module_search_path);
     SET_SYS_FROM_STRING_BORROW("executable", config->executable);
     SET_SYS_FROM_STRING_BORROW("prefix", config->prefix);
     SET_SYS_FROM_STRING_BORROW("base_prefix", config->base_prefix);
@@ -2488,19 +2475,12 @@
         SET_SYS_FROM_STRING_BORROW("argv", config->argv);
     }
     if (config->warnoptions != NULL) {
-        COPY_LIST("warnoptions", warnoptions);
+        SET_SYS_FROM_STRING_BORROW("warnoptions", config->warnoptions);
     }
     if (config->xoptions != NULL) {
-        PyObject *dict = PyDict_Copy(config->xoptions);
-        if (dict == NULL) {
-            return -1;
-        }
-        SET_SYS_FROM_STRING_BORROW("_xoptions", dict);
-        Py_DECREF(dict);
+        SET_SYS_FROM_STRING_BORROW("_xoptions", config->xoptions);
     }
 
-#undef COPY_LIST
-
     /* Set flags to their final values */
     SET_SYS_FROM_STRING_INT_RESULT("flags", make_flags());
     /* prevent user from creating new instances */