TST: Skip IntervalTree construction overflow test on 32bit
- [X] xref https://github.com/pandas-dev/pandas/pull/25498#issuecomment-469672734
- [X] tests added / passed
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Skipping this test as it's failing on 32bit due to #23440.  Note that this is consistent with #23442 where a few other tests that are being skipped for the same reason.

cc @jreback 