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ARROW-14686: [Python][C++] make byte order detection for numpy builtin type correct

This PR fixes the following test failures

```
FAILED pyarrow/tests/test_array.py::test_array_from_numpy_unicode - UnicodeDecodeError: 'utf-32-le' codec can't decode bytes in position 0-3: code point not in range(0x110000)
FAILED pyarrow/tests/test_array.py::test_array_from_strided - UnicodeDecodeError: 'utf-32-le' codec can't decode bytes in position 0-3: code point not in range(0x110000)
FAILED pyarrow/tests/test_array.py::test_array_from_numpy_str_utf8 - UnicodeDecodeError: 'utf-32-le' codec can't decode bytes in position 0-3: code point not in range(0x110000)
```

Closes #11687 from kiszk/ARROW-14686

Authored-by: Kazuaki Ishizaki <ishizaki@jp.ibm.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>