btrfs-progs: drop dependency on acl and attr

btrfs-progs does not depend on libacl since version v4.0.1:

  ab5984f btrfs-progs: convert: drop dependency on sys/acl.h
  https://git.kernel.org/cgit/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=ab5984ff6cce6f12063720b6dafc1afcd6606853

Moreover, btrfs-progs does not depend on attr since version v3.14:

  b5fe148 btrfs-progs: include <sys/xattr.h> instead of <attr/xattr.h>
  https://git.kernel.org/cgit/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=b5fe148715ea295e2b951ec6c90409b9d81978d8



Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>