build: disable TCP_NODELAY for emscripten#18155
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In WebAssembly, using
TCP_NODELAYfails with:Add a new feature macro in
curl_setup.htelling whetherTCP_NODELAYis known to be supported at runtime, when defined at compile-time.
Keep
TCP_NODELAYguards at their current positions to ensure thenecessary headers (e.g.
netinet/tcp.handnetinet/in.h) define it.Reported-by: Jeroen Ooms
Fixes #17974
Can be generalized more in case other platforms also
need this, but for now keep it simple?