Ignore errors in talk socket shutdown

macOS apparently shuts down the socket before shutdown can be called.

kitty/boss.py

@@ -540,7 +540,10 @@ class Boss:
         try:
             s.connect(address)
             s.sendall(b'c')
-            s.shutdown(socket.SHUT_RDWR)
+            try:
+                s.shutdown(socket.SHUT_RDWR)
+            except EnvironmentError:
+                pass
             s.close()
         except Exception:
             pass

kitty/main.py

@@ -48,13 +48,19 @@ def talk_to_instance(args):
 
     data = json.dumps(data, ensure_ascii=False).encode('utf-8')
     single_instance.socket.sendall(data)
-    single_instance.socket.shutdown(socket.SHUT_RDWR)
+    try:
+        single_instance.socket.shutdown(socket.SHUT_RDWR)
+    except EnvironmentError:
+        pass
     single_instance.socket.close()
 
     if args.wait_for_single_instance_window_close:
         conn = notify_socket.accept()[0]
         conn.recv(1)
-        conn.shutdown(socket.SHUT_RDWR)
+        try:
+            conn.shutdown(socket.SHUT_RDWR)
+        except EnvironmentError:
+            pass
         conn.close()