Update Makefile - lazy set for PKGS variable
Update Makefile - lazy set for PKGS variable

Using lazy set we can run targets that are not requring PKGS without
requiring glide.
Lazy set is expended when variable is used, not when declared.

ashetty1/kompose,surajnarwade/kompose,cdrage/kompose,gitlawr/kompose,rupalibehera/kompose,surajnarwade/kompose,kadel/kompose,rupalibehera/kompose,procrypt/kompose,skippbox/kompose,kubernetes/kompose,ashetty1/kompose,containscafeine/kompose,procrypt/kompose,containscafeine/kompose,kubernetes/kompose,containscafeine/kompose,surajnarwade/kompose,skippbox/kompose,kadel/kompose,rupalibehera/kompose,skippbox/kompose,cdrage/kompose,procrypt/kompose,ashetty1/kompose,gitlawr/kompose,gitlawr/kompose