Disable unused Python 2 variant. am: 3f0a736d66 am: 6dcceb3be8 am: 6328debc9c am: a34d5dfced am: 6aee3dead4

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

Change-Id: I844a1397167fcec2cd05a9b3fea2972c9244e26f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>