tcpsso: remove support for some IPPROTO_TCP-level socket option names

[tuexen]

Summary

Remove support for IPPROTO_TCP-level socket option names, because these names will be removed from the source tree soon. The corresponding socket options are not implemented by the TCP stack at all.

This change was suggested by Peter Lei.

[cc]

Are you planning to remove the corresponding code in kernel space in a separate patch?

[tuexen]

In D46437#1058468, @cc wrote:

Are you planning to remove the corresponding code in kernel space in a separate patch?

Yes. I also need to patch the read_bbrlog port first. Once the consumers are gone, I'll remove the code from kernel space. In most cases, these are just #defines in tcp.h with no corresponding code.