[getdns-api] A couple of more changes

[Melinda Shore]

1) We'd like to remove getdns_free_sync_request_memory(),
   as getdns_dict_destroy() can be used to release the memory
   in question, and
2) From the sync functions we'd like to remove the the
   response_length parameter and pass the response parameter
   by reference (**response rather than *response)

Melinda

-- 
Melinda Shore
No Mountain Software
melinda.shore at nomountain.net

"Software longa, hardware brevis."