pkgadd: add lzip support (closes FS#1638)

pkgadd: add lzip support (closes FS#1638)

It should complete the commit ae5df6094b41 ('pkgmk: dropped bzip2 support, added support for lzip').

Signed-off-by: Fun 
  • [DH] pkgmk.conf.5.in
  • [DH] pkgutil.cc