Disable unused Python 2 variant. am: f691762adf am: 3e9e7b7bd4 am: 5d1a46d6f5 am: a984a6de2c

Original change: https://android-review.googlesource.com/c/platform/external/python/rsa/+/2221334

Change-Id: Icefd054d801ea5e0349d49a6672ae79b1292e22c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>