bpo-32030: Add _Py_EncodeLocaleRaw() (#4961)

Replace Py_EncodeLocale() with _Py_EncodeLocaleRaw() in:

* _Py_wfopen()
* _Py_wreadlink()
* _Py_wrealpath()
* _Py_wstat()
* pymain_open_filename()

These functions are called early during Python intialization, only
the RAW memory allocator must be used.

Modules/getpath.c

@@ -140,13 +140,13 @@ _Py_wstat(const wchar_t* path, struct stat *buf)
 {
     int err;
     char *fname;
-    fname = Py_EncodeLocale(path, NULL);
+    fname = _Py_EncodeLocaleRaw(path, NULL);
     if (fname == NULL) {
         errno = EINVAL;
         return -1;
     }
     err = stat(fname, buf);
-    PyMem_Free(fname);
+    PyMem_RawFree(fname);
     return err;
 }