[libc++] NFC: Normalize `#endif //` comment indentation

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/stdlib.h b/include/stdlib.h
index 9ce0485..242eedc 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -150,6 +150,6 @@
 #endif // _LIBCPP_HAS_NO_LONG_LONG
 #endif // _LIBCPP_MSVCRT / __sun__
 } // extern "C++"
-#endif  // __cplusplus
+#endif // __cplusplus
 
-#endif  // _LIBCPP_STDLIB_H
+#endif // _LIBCPP_STDLIB_H