[Wget-dev] wget2 | openssl doesn't work on linux kernels before 4.11 (aka kernels without TCP_FASTOPEN_CONNECT) (#472)

[Jon]

Jon created an issue: https://gitlab.com/gnuwget/wget2/issues/472



If you build wget2 against openssl on a linux kernel before 4.11 it uses the 
pre-`TCP_FASTOPEN_CONNECT` code path which isn't fully implemented in the 
openssl wrapper. Kernels starting with 4.11 work fine because the 
`TCP_FASTOPEN_CONNECT` code path works. The workaround for pre-4.11 kernels is 
to use `--no-tcp-fast-open` so that it doesn't try to use fast open at all.

For fast open to work with pre-4.11 kernels wget2's openssl wrapperr needs 
something like the `sendmsg(MSG_FASTOPEN)` call like the gnutls wrapper has.

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