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

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

Change-Id: Icec208bab6baa1dca403e8eaa17fcdb4cc97f163
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>