TCP FastOpen does not work in some Linux .NET binaries

[wfurt]

This seems to be build problem for glibc flavors of Linux. (Alpine seems fine)
This is due to how do we build it in CI and if runtime is build directly or via source-build it FastOpen works as well.
This is because the azurelinux-3.0-net9.0-cross-* images have very old kernel header and the naive PAL fails to detect support for 'TCP_FASTOPEN_CONNECT`.

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/ncl
See info in area-owners.md if you want to be subscribed.

[karelz]

Reopening for servicing