gnu11 is the default now. am: efd54f63d6 am: 802cf950ae

Original change: https://android-review.googlesource.com/c/platform/external/ethtool/+/2096955

Change-Id: I37dc81161488b24c514ec83a8832af12b1776af6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>