Disable unused Python 2 variant. am: e90ad5e404

Original change: https://android-review.googlesource.com/c/platform/external/python/cachetools/+/2221305

Change-Id: I8ad0c088e46d61df7fabc25ec123975e2dddb5f1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>