move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/transport/once_close_test.go

@@ -0,0 +1,47 @@
+package transport
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/testutil"
+)
+
+type closeMockListener struct {
+	closed int
+	err    error
+}
+
+func (m *closeMockListener) Accept() (net.Conn, error) {
+	panic("unexpected call")
+}
+
+func (m *closeMockListener) Addr() net.Addr {
+	panic("unexpected call")
+}
+
+func (m *closeMockListener) Close() error {
+	m.closed++
+	return m.err
+}
+
+func Test_onceCloseListener_Close(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		m := &closeMockListener{}
+		once := onceCloseListener{Listener: m}
+		require.NoError(t, once.Close())
+		require.NoError(t, once.Close())
+		require.Equal(t, 1, m.closed)
+	})
+
+	t.Run("With Error", func(t *testing.T) {
+		testErr := testutil.TestError()
+		m := &closeMockListener{err: testErr}
+		once := onceCloseListener{Listener: m}
+		require.Equal(t, testErr, once.Close())
+		require.Equal(t, testErr, once.Close())
+		require.Equal(t, 1, m.closed)
+	})
+}