Description: Patch regenerate.sh script to rebuild all *.pb.go files.
--- a/regenerate.sh
+++ b/regenerate.sh
@@ -19,6 +19,8 @@
 PROTO_DIRS=(
   jsonpb/jsonpb_test_proto
   proto
+  protoc-gen-go/descriptor
+  protoc-gen-go/plugin
   protoc-gen-go/testdata
 )
 for dir in ${PROTO_DIRS[@]}; do
@@ -50,3 +52,7 @@
 protoc --go_out=paths=source_relative:$tmpdir google/protobuf/descriptor.proto
 cp $tmpdir/google/protobuf/descriptor.pb.go protoc-gen-go/descriptor
 cp $PROTO_INCLUDE/google/protobuf/descriptor.proto protoc-gen-go/descriptor
+
+echo "# google/protobuf/field_mask.proto"
+mkdir -p vendor
+protoc -I$PROTO_INCLUDE --go_out=plugins=grpc:vendor google/protobuf/field_mask.proto