The documentation states that both 0x42 (this transponder) and 0x46
(other transponder) tables are accepted, but the check is hard-coded
against 0x42. Make it accept both, in the style of the other decoders.
Signed-off-by: Jean-Paul Saman <jpsaman@videolan.org>

MSG_CMSG_CLOEXEC is a flag for recvmsg and not recv. Thus rewrite
{udp,tcp}_open to create sockets with SOCK_CLOEXEC. If SOCK_CLOEXEC is not
available, FD_CLOEXEC is set instead.

The function dvbpsi_CheckPSISection() correctly checked the TOT table, but
not the TDT table. This patch corrects this ommission.

examples/dvbinfo/udp.c: Some OS-es do not support SOL_IP and SOL_IPV6, so provide alternatives for them.

Use explicite parenthesis around ? : constructions.