mount-util: fold what we need from get_mount_flags() bind_remount_one_with_mountinfo()
    
    And get rid of get_mount_flags() altogether.
    
    (This drops the statvfs() fallback that get_mount_flags() did. That
    fallback was incomplete however, and mostly hid errors. Our primary
    avenue to get mount flags is /proc/self/mountinfo and we should trust
    it, and fix bugs we might encounter with it, but not tape over it.
    Dropping the fallback is relevant in particular as it actually returned
    mount flags for any path, not just mount points, which was very icky.)
    
    (cherry picked from commit 2c5ff8ea76d8c3c9944567ae97f498925dfcd443)