BUILD: tcp-act: avoid warning when set-mark / set-tos are not supported

BUILD: tcp-act: avoid warning when set-mark / set-tos are not supported

Since recent commit 469c06c30 ("MINOR: http-act/tcp-act: Add "set-mark"
and "set-tos" for tcp content rules") there's a build warning (or error)
on Windows due to static function tcp_action_set_mark() not being used
because the set-mark functionality is not supported there. It's caused
by the fact that only the parsing function uses it so if the code is
ifdefed out the function remains unused.

Let's surround it with ifdefs as well, and do the same for
tcp_action_set_tos() which could suffer the same fate on operating systems
not defining IP_TOS.

This may need to be backported if the patch above is backported. Also
be careful, the condition was adjusted to cover FreeBSD after commit
f7f53afcf ("BUILD/MEDIUM: tcp: set-mark setting support for FreeBSD.").