internal/testprotos: add missing go_package option

Change-Id: If28f15266349b2c05c209202c38bc98dc43f7dbd
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/219297
Reviewed-by: Joe Tsai <joetsai@google.com>
diff --git a/internal/testprotos/required/required.pb.go b/internal/testprotos/required/required.pb.go
index 5aab58c..065fcbf 100644
--- a/internal/testprotos/required/required.pb.go
+++ b/internal/testprotos/required/required.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: internal/testprotos/required/required.proto
 
-package goproto_proto_testrequired
+package required
 
 import (
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
@@ -841,7 +841,10 @@
 	0x65, 0x71, 0x75, 0x69, 0x72, 0x65, 0x64, 0x2e, 0x47, 0x72, 0x6f, 0x75, 0x70, 0x2e, 0x47, 0x72,
 	0x6f, 0x75, 0x70, 0x52, 0x05, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x1a, 0x15, 0x0a, 0x05, 0x47, 0x72,
 	0x6f, 0x75, 0x70, 0x12, 0x0c, 0x0a, 0x01, 0x76, 0x18, 0x01, 0x20, 0x01, 0x28, 0x05, 0x52, 0x01,
-	0x76,
+	0x76, 0x42, 0x39, 0x5a, 0x37, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f, 0x6c, 0x61,
+	0x6e, 0x67, 0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f,
+	0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x73, 0x2f, 0x72, 0x65, 0x71, 0x75, 0x69, 0x72, 0x65, 0x64,
 }
 
 var (
diff --git a/internal/testprotos/required/required.proto b/internal/testprotos/required/required.proto
index 911c525..53c4198 100644
--- a/internal/testprotos/required/required.proto
+++ b/internal/testprotos/required/required.proto
@@ -6,6 +6,8 @@
 
 package goproto.proto.testrequired;
 
+option go_package = "google.golang.org/protobuf/internal/testprotos/required";
+
 message Int32 {
   required int32 v = 1;
 }