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

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

Change-Id: Ief3f558e6ccf08bb57e30d1d08b2b0cf02b1b420
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>