rpcrt4: Set the socket back to blocking in rpcrt4_conn_tcp_handoff as
the read and write function for the protseq assume that syscalls will block.

dlls/rpcrt4/rpc_transport.c

diff --git a/dlls/rpcrt4/rpc_transport.c b/dlls/rpcrt4/rpc_transport.c
index d50b60b..a90b73c 100644
--- a/dlls/rpcrt4/rpc_transport.c
+++ b/dlls/rpcrt4/rpc_transport.c
@@ -684,6 +684,8 @@
     ERR("Failed to accept a TCP connection: error %d\n", ret);
     return RPC_S_SERVER_UNAVAILABLE;
   }
+  /* reset to blocking behaviour */
+  fcntl(ret, F_SETFL, 0);
   client->sock = ret;
   TRACE("Accepted a new TCP connection\n");
   return RPC_S_OK;