Set libarchive dependency on libxml2 for unix and apple

Status Job ID Name Coverage
  External
passed cdash

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

00:51:17

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

01:28:55

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

00:00:05

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

00:57:27

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

01:40:40

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

01:59:16

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

01:25:37

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

01:08:08

passed ghostflow-branch-check-master

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

01:20:41

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

00:00:06

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

00:46:32

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

00:29:50

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

01:35:01

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

02:16:41

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

01:08:31

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

01:05:16