[DCCP]: Move the ack vector code to net/dccp/ackvec.[ch]

Isolating it, that will be used when we introduce a CCID2 (TCP-Like)
implementation.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/linux/dccp.h
Simple merge

diff --cc net/dccp/Makefile
Simple merge

diff --cc net/dccp/ackvec.c
Simple merge

diff --cc net/dccp/ackvec.h
Simple merge

diff --cc net/dccp/dccp.h
Simple merge

diff --cc net/dccp/input.c
Simple merge

diff --cc net/dccp/ipv4.c
Simple merge

diff --cc net/dccp/minisocks.c
Simple merge

diff --cc net/dccp/options.c
Simple merge

diff --cc net/dccp/output.c
Simple merge