Remove macOS Socket.Select workaround — the dotnet/corefx#39617 bug is fixed in .NET 9+

Agent-Logs-Url: https://github.com/zeromq/netmq/sessions/0798ef7e-5281-4907-afe0-676d68fe60c2

Co-authored-by: drewnoakes <[email protected]>

Author: Copilot

src/NetMQ/Core/Utils/Poller.cs

@@ -23,9 +23,6 @@ You should have received a copy of the GNU Lesser General Public License
 using System.Collections.Generic;
 using System.Linq;
 using System.Net.Sockets;
-#if !NETFRAMEWORK
-using System.Runtime.InteropServices;
-#endif
 using System.Threading;
 
 namespace NetMQ.Core.Utils
@@ -281,26 +278,7 @@ private void Loop()
                 try
                 {
                     timeout = timeout != 0 ? timeout * 1000 : -1;
-#if NETFRAMEWORK
                     Socket.Select(readList, null, errorList, timeout);
-#else
-                    if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
-                    {
-                        // Socket.Select does not work properly on macOS .NET Core when readList and errorList are passed
-                        // together. To avoid this problem, we call the Select function separately for errorList.
-                        // Please refer to this issue: https://github.com/dotnet/corefx/issues/39617
-                        SocketUtility.Select(readList, null, null, timeout);
-                        // If the first select found readable sockets, use a non-blocking (0) timeout for the
-                        // error check so we don't block indefinitely on a stale list before processing InEvent.
-                        // Events queued by the first select (e.g. a ForceStop command) are not yet processed
-                        // because InEvent runs after both selects, so a second infinite-wait here would deadlock.
-                        SocketUtility.Select(null, null, errorList, readList.Count > 0 ? 0 : timeout);
-                    }
-                    else
-                    {
-                        Socket.Select(readList, null, errorList, timeout);
-                    }
-#endif
                 }
                 catch (SocketException)
                 {