package/arptables: bump to version 0.0.5

- Update site to retrieve latest version
- Remove first, second and third patches (already in version)
- Use the new COPYING file as the license file
- arptables binary is now named arptables-legacy since
  http://git.netfilter.org/arptables/commit/?id=28b22d55615447c94c5058e0aacec612ebc27f2a



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>