TST: the pandas test suite fails on 32bit systems
I've been trying tonight to get the test suite to pass and keep getting some failures:

```
Results (25.73s):
     830 passed
       6 failed
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[None-nan]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[None-unique_nulls_fixture22]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[nan-None]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[nan-unique_nulls_fixture22]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[unique_nulls_fixture2-None]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[unique_nulls_fixture2-nan]
       2 xfailed
      63 skipped
```

The issue is related to integer dtypes:

```
E       AssertionError: numpy array are different
E
E       Attribute "dtype" are different
E       [left]:  int32
E       [right]: int64
```

Can anyone confirm if this is a failure on pandas on windows?
