Disable unused Python 2 variant. am: ece6fb2ed3 am: 7e85dfce85 am: b94d3f1d52 am: b5b1579c65

Original change: https://android-review.googlesource.com/c/platform/external/python/pycparser/+/2222463

Change-Id: Icbfe245921b4ea4f8b775e7306b52123284d468b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>