Log Message:
update to 2.2.1
changes:
* fix a potential mem leak content_type and osip_message_parse.
* fix osip_body_clone method (add terminating NULL)
* fix for binary support when multipart is used.
* automatic check for reliable protocol SCTP and TLS.
* avoid <winsock.h> inclusion so user can (and must) now include either
  <winsock.h> or <winsock2.h> before including <osip/osip2.h>