encoding/binary: add String and GoString method to nativeEndian

Updates golang#57237

Change-Id: Ib626610130cae9c1d1aff5dd2a5035ffde0e127f
Reviewed-on: https://go-review.googlesource.com/c/go/+/463985
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: xie cui <523516579@qq.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

src/encoding/binary/binary.go

@@ -210,6 +210,10 @@ func (bigEndian) String() string { return "BigEndian" }
 
 func (bigEndian) GoString() string { return "binary.BigEndian" }
 
+func (nativeEndian) String() string { return "NativeEndian" }
+
+func (nativeEndian) GoString() string { return "binary.NativeEndian" }
+
 // Read reads structured binary data from r into data.
 // Data must be a pointer to a fixed-size value or a slice
 // of fixed-size values.