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v4: rpcrt4/tests: Use common code to set the firewall.
wsdapi/tests: Use common code to set the firewall.
dpnet/tests: Use common code to set the firewall.
dplayx/tests: Use common code to set the firewall.
webservices/tests: Move firewall code to a common header.
https://gitlab.winehq.org/wine/wine/-/merge_requests/1987
On Windows it seems sending to port 0 does nothing and does not error.
Presently sendmsg errors with EINVAL.
This works around it, by checking if it's port 0 then skipping the data.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/2100