Add libarchive as an optional dependency for smtk

Status Job ID Name Coverage
  External
passed cdash

pending cmb@master-junction-osx-shared-release+superbuild
failed cmb@master-kerbin-windows-shared-release+protobuf+superbuild

failed cmb@master-kerbin-windows-shared-release+superbuild

failed cmb@master-moho-linux-shared-relwithdebinfo+python3+superbuild

failed cmb@master-moho-linux-shared-relwithdebinfo+superbuild

failed cmb@master-norkit-osx-shared-release+superbuild

failed cmb@master-praxis-windows-shared-release+superbuild

failed cmb@master-talosiv-osx-shared-release+superbuild

failed cmb@master-tatooine-osx-shared-release+superbuild

passed ghostflow-branch-check-master

pending smtk@master-junction-osx-shared-release+superbuild
passed smtk@master-kerbin-windows-shared-release+superbuild

passed smtk@master-moho-linux-shared-relwithdebinfo+python3+superbuild

passed smtk@master-moho-linux-shared-relwithdebinfo+superbuild

passed smtk@master-moho-linux-shared-relwithdebinfo+superbuild+vtk

passed smtk@master-norkit-osx-shared-release+superbuild

passed smtk@master-praxis-windows-shared-release+superbuild

passed smtk@master-talosiv-osx-shared-release+superbuild

passed smtk@master-tatooine-osx-shared-release+superbuild

failed cmb@master-kerbin-windows-shared-release+protobuf+superbuild

01:43:16

failed cmb@master-kerbin-windows-shared-release+superbuild

01:34:48

failed cmb@master-moho-linux-shared-relwithdebinfo+python3+superbuild

00:48:01

failed cmb@master-moho-linux-shared-relwithdebinfo+superbuild

00:53:26

failed cmb@master-norkit-osx-shared-release+superbuild

02:28:50

failed cmb@master-praxis-windows-shared-release+superbuild

02:02:57

failed cmb@master-talosiv-osx-shared-release+superbuild

01:29:35

failed cmb@master-tatooine-osx-shared-release+superbuild

01:23:19

passed smtk@master-kerbin-windows-shared-release+superbuild

01:21:06

passed smtk@master-moho-linux-shared-relwithdebinfo+python3+superbuild

00:39:35

passed smtk@master-moho-linux-shared-relwithdebinfo+superbuild

00:41:47

passed smtk@master-moho-linux-shared-relwithdebinfo+superbuild+vtk

00:27:36

passed smtk@master-norkit-osx-shared-release+superbuild

01:50:35

passed smtk@master-praxis-windows-shared-release+superbuild

01:39:25

passed smtk@master-talosiv-osx-shared-release+superbuild

01:08:11

passed smtk@master-tatooine-osx-shared-release+superbuild

01:01:20