Disable unused Python 2 variant. am: ece6fb2ed3

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

Change-Id: Ib0a82bb258c9f33f5594ddd5040bf3134fe428d0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>