gnu11 is the default now. am: ceb1e694d9

Original change: https://android-review.googlesource.com/c/platform/external/newfs_msdos/+/2097133

Change-Id: I0981dae3345d9e074f06ecc390c8bb0ec44b67b7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>