Update t/src/hash.t to recent protype changes
Update t/src/hash.t to recent protype changes

This change gets the test compile again, and fixes the output of
test 12 - dump_hash.
Furthermore some warnings about using NULL as 3 argument in
string_from_cstring are removed.

I did not address the issue of hash_get yet so some tests are still failing


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@4748 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot