Disable unused Python 2 variant. am: 3f0a736d66

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

Change-Id: If7fa0a475b97f0a986b282a298f20f8b63a618a7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>