aux/socket: patch scheduling bug in socket egg

It's possible for the thread to be interrupted between configuring the
timeout and the file descriptor wait. This causes a low-probability 60
second wait until the timeout expires.

Now that this is fixed, we can set a normal timeout on the socket once
again, so do that.

Link: https://github.com/ursetto/socket-egg/pull/7

aux/overlay.nix

@@ -7,7 +7,8 @@ _: prevpkgs: {
 
       socket = preveggs.socket.overrideAttrs (o: {
         preBuild = null;
-        postPatch = "echo 'touch socket-config' >> build-socket-config";
+        patches = (o.patches or []) ++ [ ./socket.diff ];
+        postPatch = null;
       });
     });
   });