Disable -Wno-single-bit-bitfield-constant-conversion locally am: e190c6100b

Original change: https://android-review.googlesource.com/c/platform/external/python/cpython2/+/3237111

Change-Id: Id900dccbb6dfdd1d5ac67ebd82abec96aa6b3875
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>