`np.rec.fromrecords` looks broken since 1.14.0

```python
>>> dt = [('a', int), ('b', float)]
>>> np.rec.fromrecords([ [1, 1.5], [2, 2.5] ], dtype=dt)
rec.array([[(1, 1. ), (1, 1.5)],
           [(2, 2. ), (2, 2.5)]],
          dtype=[('a', '<i8'), ('b', '<f8')])
```

while in 1.13.3 that would be:
```python
rec.array([(1,  1.5), (2,  2.5)], 
          dtype=[('a', '<i8'), ('b', '<f8')])
```