problem with build/check-requires-timestamp target

The `build/check-requires-timestamp` target fails the files below (claiming missing requires for `ol.geom` in `ol/geom/point.js`).

`ol/geom/base.js`:
```js
goog.provide('ol.geom');
```

`ol/geom/point.js`:
```js
goog.provide('ol.geom.Point');

ol.geom.Point = function() {};
```