Disable unused Python 2 variant. am: 7db25af7a5 am: e3b05970d4 am: 6cf5910b3f am: d48cbd09ef am: ffdcc7322b

Original change: https://android-review.googlesource.com/c/platform/external/python/pyasn1/+/2221453

Change-Id: I90387d931c6aada644c942a09d72002689cfee05
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>