C11 has been the platform (and compiler) default for a while now. am: a9963b538c am: e10ea8f194 am: 6a5d255168 am: 2e4d6eb116

Original change: https://android-review.googlesource.com/c/platform/external/mtools/+/2628331

Change-Id: I22e41193692c17842dcd2903205cb646a115b455
Signed-off-by: Automerger Merge Worker <[email protected]>