Disable unused Python 2 variant. am: 0200b44970

Original change: https://android-review.googlesource.com/c/platform/external/python/cffi/+/2221328

Change-Id: Ia37d5da74ac1e4b51c34202235e4afd140bb02f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>