Disable unused Python 2 variant. am: 3f0a736d66 am: 6dcceb3be8

Original change: https://android-review.googlesource.com/c/platform/external/python/dateutil/+/2221449

Change-Id: Id6b512f5a6d253e86a08dad1f90db54de300c04d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>