python-dateutil will be updated to version 2.x and there may be changes that affect this package. If python-freezegun will work with the newer python-dateutil, you can safely close this bug. If python-freezegun really does require python-dateutil 1.5, please use Requires: python-dateutil15 for Fedora versions of the package until it can be updated.
I pushed a commit which turns tests on in the freezegun package (and built it in koji --scratch and locally). Tests pass both on python-dateutil-1.5/python3-dateutil-2.2 and python-dateutil-2.4/python3-dateutil-2.4.