message: util: Add missing fstatfs to syscall sandbox
diff: @@ -581,7 +581,7 @@ public:
  allowed_syscalls.insert(__NR_fdatasync); // synchronize a file's in-core state with storage device
  allowed_syscalls.insert(__NR_flock); // apply or remove an advisory lock on an open file
  allowed_syscalls.insert(__NR_fstat); // get file status
  - allowed_syscalls.insert(__NR_newfstatat); // get file status
  + allowed_syscalls.insert(__NR_fstatfs); // get file system status
  allowed_syscalls.insert(__NR_fsync); // synchronize a file's in-core state with storage device
  allowed_syscalls.insert(__NR_ftruncate); // truncate a file to a specified length
  allowed_syscalls.insert(__NR_getcwd); // get current working directory
  @@ -589,6 +589,7 @@ public:
  allowed_syscalls.insert(__NR_getdents64); // get directory entries
  allowed_syscalls.insert(__NR_lstat); // get file status
  allowed_syscalls.insert(__NR_mkdir); // create a directory
  + allowed_syscalls.insert(__NR_newfstatat); // get file status
  allowed_syscalls.insert(__NR_open); // open and possibly create a file
  allowed_syscalls.insert(__NR_openat); // open and possibly create a file
  allowed_syscalls.insert(__NR_readlink); // read value of a symbolic link
  