update descriptor.proto's go_package

This change has already been made in google's repo.
Replicating the change here to unblock work on genproto.

csharp/src/Google.Protobuf/Reflection/Descriptor.cs

@@ -142,9 +142,10 @@ namespace Google.Protobuf.Reflection {
             "CmFubm90YXRpb24YASADKAsyLS5nb29nbGUucHJvdG9idWYuR2VuZXJhdGVk",
             "Q29kZUluZm8uQW5ub3RhdGlvbhpPCgpBbm5vdGF0aW9uEhAKBHBhdGgYASAD",
             "KAVCAhABEhMKC3NvdXJjZV9maWxlGAIgASgJEg0KBWJlZ2luGAMgASgFEgsK",
-            "A2VuZBgEIAEoBUJYChNjb20uZ29vZ2xlLnByb3RvYnVmQhBEZXNjcmlwdG9y",
-            "UHJvdG9zSAFaCmRlc2NyaXB0b3KiAgNHUEKqAhpHb29nbGUuUHJvdG9idWYu",
-            "UmVmbGVjdGlvbg=="));
+            "A2VuZBgEIAEoBUKMAQoTY29tLmdvb2dsZS5wcm90b2J1ZkIQRGVzY3JpcHRv",
+            "clByb3Rvc0gBWj5naXRodWIuY29tL2dvbGFuZy9wcm90b2J1Zi9wcm90b2Mt",
+            "Z2VuLWdvL2Rlc2NyaXB0b3I7ZGVzY3JpcHRvcqICA0dQQqoCGkdvb2dsZS5Q",
+            "cm90b2J1Zi5SZWZsZWN0aW9u"));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedClrTypeInfo(null, new pbr::GeneratedClrTypeInfo[] {

src/google/protobuf/descriptor.pb.cc

@@ -734,12 +734,13 @@ void protobuf_AddDesc_google_2fprotobuf_2fdescriptor_2eproto_impl() {
       "(\0132-.google.protobuf.GeneratedCodeInfo.A"
       "nnotation\032O\n\nAnnotation\022\020\n\004path\030\001 \003(\005B\002\020"
       "\001\022\023\n\013source_file\030\002 \001(\t\022\r\n\005begin\030\003 \001(\005\022\013\n"
-      "\003end\030\004 \001(\005BX\n\023com.google.protobufB\020Descr"
-      "iptorProtosH\001Z\ndescriptor\242\002\003GPB\252\002\032Google"
-      ".Protobuf.Reflection"
+      "\003end\030\004 \001(\005B\214\001\n\023com.google.protobufB\020Desc"
+      "riptorProtosH\001Z>github.com/golang/protob"
+      "uf/protoc-gen-go/descriptor;descriptor\242\002"
+      "\003GPB\252\002\032Google.Protobuf.Reflection"
   };
   ::google::protobuf::DescriptorPool::InternalAddGeneratedFile(
-      descriptor, 5500);
+      descriptor, 5553);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/descriptor.proto", &protobuf_RegisterTypes);
   ::google::protobuf::internal::OnShutdown(&protobuf_ShutdownFile_google_2fprotobuf_2fdescriptor_2eproto);

src/google/protobuf/descriptor.proto

@@ -40,7 +40,7 @@
 syntax = "proto2";
 
 package google.protobuf;
-option go_package = "descriptor";
+option go_package = "github.com/golang/protobuf/protoc-gen-go/descriptor;descriptor";
 option java_package = "com.google.protobuf";
 option java_outer_classname = "DescriptorProtos";
 option csharp_namespace = "Google.Protobuf.Reflection";