package/dhcp: bump to version 4.4.1

package/dhcp: bump to version 4.4.1

- Use --with-bind-extra-config option to:
  - add --without-zlib otherwise static build will fail if zlib is found
    on host
  - Add --without-dlopen otherwise static build will fail
- Drop all patches (already in version)
- Drop autoreconf (not needed anymore)
- Update license to MPL-2.0:
  https://www.isc.org/blogs/isc-dhcp-moves-to-mpl-2-0-license
- Update hash of license file

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