Disable unused Python 2 variant. am: 7c52d39928 am: 30fa17ab2e am: d30a645c0f am: 4df660d4e3

Original change: https://android-review.googlesource.com/c/platform/external/python/six/+/2221607

Change-Id: I4e42c92332f3e8e3d2997e3a5da43f8c52c2a787
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>