Disable unused Python 2 variant. am: 4b316bcda8 am: f87562050e am: a4473733e8 am: 03dcaf51ca am: 61b5b6931e

Original change: https://android-review.googlesource.com/c/platform/external/python/enum34/+/2221450

Change-Id: Ib78d32fabde84026a170e085fb7e3d8921f028a2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>