wasmtime: default to blocking sockets #5633
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This commit is a follow-up on f81a663, (#3729)
in which pre-opened socket support was added, but sockets opened by
wasmtime were made to default to non-blocking mode and pre-opened
sockets passed to wasmtime via
listenfd
were explicitly set tonon-blocking mode.
Avoid explicitly setting the mode and use OS default mode in the
former case or whichever mode was pre-configured in the latter.
Note, that Windows, POSIX and Berkeley sockets are blocking by default.