all: make .proto file names relative to module root

Change the protoc flags such that when one of our test .proto files
imports another, the filename is consistently specified relative to the
module root.

Change-Id: I690282795cef23347c8794c1c6357e4fe9560d8a
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/217762
Reviewed-by: Joe Tsai <joetsai@google.com>
diff --git a/internal/testprotos/legacy/legacy.pb.go b/internal/testprotos/legacy/legacy.pb.go
index 5b3cc66..d486d3b 100644
--- a/internal/testprotos/legacy/legacy.pb.go
+++ b/internal/testprotos/legacy/legacy.pb.go
@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
-// source: legacy/legacy.proto
+// source: internal/testprotos/legacy/legacy.proto
 
 package legacy
 
@@ -48,7 +48,7 @@
 func (x *Legacy) Reset() {
 	*x = Legacy{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_legacy_legacy_proto_msgTypes[0]
+		mi := &file_internal_testprotos_legacy_legacy_proto_msgTypes[0]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -61,7 +61,7 @@
 func (*Legacy) ProtoMessage() {}
 
 func (x *Legacy) ProtoReflect() protoreflect.Message {
-	mi := &file_legacy_legacy_proto_msgTypes[0]
+	mi := &file_internal_testprotos_legacy_legacy_proto_msgTypes[0]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -74,7 +74,7 @@
 
 // Deprecated: Use Legacy.ProtoReflect.Descriptor instead.
 func (*Legacy) Descriptor() ([]byte, []int) {
-	return file_legacy_legacy_proto_rawDescGZIP(), []int{0}
+	return file_internal_testprotos_legacy_legacy_proto_rawDescGZIP(), []int{0}
 }
 
 func (x *Legacy) GetF1() *proto2_20160225_2fc053c5.Message {
@@ -161,111 +161,127 @@
 	return nil
 }
 
-var File_legacy_legacy_proto protoreflect.FileDescriptor
+var File_internal_testprotos_legacy_legacy_proto protoreflect.FileDescriptor
 
-var file_legacy_legacy_proto_rawDesc = []byte{
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 }
 
 var (
-	file_legacy_legacy_proto_rawDescOnce sync.Once
-	file_legacy_legacy_proto_rawDescData = file_legacy_legacy_proto_rawDesc
+	file_internal_testprotos_legacy_legacy_proto_rawDescOnce sync.Once
+	file_internal_testprotos_legacy_legacy_proto_rawDescData = file_internal_testprotos_legacy_legacy_proto_rawDesc
 )
 
-func file_legacy_legacy_proto_rawDescGZIP() []byte {
-	file_legacy_legacy_proto_rawDescOnce.Do(func() {
-		file_legacy_legacy_proto_rawDescData = protoimpl.X.CompressGZIP(file_legacy_legacy_proto_rawDescData)
+func file_internal_testprotos_legacy_legacy_proto_rawDescGZIP() []byte {
+	file_internal_testprotos_legacy_legacy_proto_rawDescOnce.Do(func() {
+		file_internal_testprotos_legacy_legacy_proto_rawDescData = protoimpl.X.CompressGZIP(file_internal_testprotos_legacy_legacy_proto_rawDescData)
 	})
-	return file_legacy_legacy_proto_rawDescData
+	return file_internal_testprotos_legacy_legacy_proto_rawDescData
 }
 
-var file_legacy_legacy_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_legacy_legacy_proto_goTypes = []interface{}{
+var file_internal_testprotos_legacy_legacy_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_internal_testprotos_legacy_legacy_proto_goTypes = []interface{}{
 	(*Legacy)(nil),                           // 0: google.golang.org.Legacy
 	(*proto2_20160225_2fc053c5.Message)(nil), // 1: google.golang.org.proto2_20160225.Message
 	(*proto3_20160225_2fc053c5.Message)(nil), // 2: google.golang.org.proto3_20160225.Message
@@ -280,7 +296,7 @@
 	(*proto2_20190205_c823c79e.Message)(nil), // 11: google.golang.org.proto2_20190205.Message
 	(*proto3_20190205_c823c79e.Message)(nil), // 12: google.golang.org.proto3_20190205.Message
 }
-var file_legacy_legacy_proto_depIdxs = []int32{
+var file_internal_testprotos_legacy_legacy_proto_depIdxs = []int32{
 	1,  // 0: google.golang.org.Legacy.f1:type_name -> google.golang.org.proto2_20160225.Message
 	2,  // 1: google.golang.org.Legacy.f2:type_name -> google.golang.org.proto3_20160225.Message
 	3,  // 2: google.golang.org.Legacy.f3:type_name -> google.golang.org.proto2_20160519.Message
@@ -300,13 +316,13 @@
 	0,  // [0:12] is the sub-list for field type_name
 }
 
-func init() { file_legacy_legacy_proto_init() }
-func file_legacy_legacy_proto_init() {
-	if File_legacy_legacy_proto != nil {
+func init() { file_internal_testprotos_legacy_legacy_proto_init() }
+func file_internal_testprotos_legacy_legacy_proto_init() {
+	if File_internal_testprotos_legacy_legacy_proto != nil {
 		return
 	}
 	if !protoimpl.UnsafeEnabled {
-		file_legacy_legacy_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+		file_internal_testprotos_legacy_legacy_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Legacy); i {
 			case 0:
 				return &v.state
@@ -323,18 +339,18 @@
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_legacy_legacy_proto_rawDesc,
+			RawDescriptor: file_internal_testprotos_legacy_legacy_proto_rawDesc,
 			NumEnums:      0,
 			NumMessages:   1,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
-		GoTypes:           file_legacy_legacy_proto_goTypes,
-		DependencyIndexes: file_legacy_legacy_proto_depIdxs,
-		MessageInfos:      file_legacy_legacy_proto_msgTypes,
+		GoTypes:           file_internal_testprotos_legacy_legacy_proto_goTypes,
+		DependencyIndexes: file_internal_testprotos_legacy_legacy_proto_depIdxs,
+		MessageInfos:      file_internal_testprotos_legacy_legacy_proto_msgTypes,
 	}.Build()
-	File_legacy_legacy_proto = out.File
-	file_legacy_legacy_proto_rawDesc = nil
-	file_legacy_legacy_proto_goTypes = nil
-	file_legacy_legacy_proto_depIdxs = nil
+	File_internal_testprotos_legacy_legacy_proto = out.File
+	file_internal_testprotos_legacy_legacy_proto_rawDesc = nil
+	file_internal_testprotos_legacy_legacy_proto_goTypes = nil
+	file_internal_testprotos_legacy_legacy_proto_depIdxs = nil
 }