third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/cmake/tests.cmake

Index: third_party/protobuf/cmake/tests.cmake
diff --git a/third_party/protobuf/cmake/tests.cmake b/third_party/protobuf/cmake/tests.cmake
index 76fdf8efdf32fe4db7d8ea7528532f84e21720b6..30214e7d0f5bedb5e50ced2eeabf9b3338d12e61 100644
--- a/third_party/protobuf/cmake/tests.cmake
+++ b/third_party/protobuf/cmake/tests.cmake
@@ -4,6 +4,7 @@ endif()
 
 option(protobuf_ABSOLUTE_TEST_PLUGIN_PATH
   "Using absolute test_plugin path in tests" ON)
+mark_as_advanced(protobuf_ABSOLUTE_TEST_PLUGIN_PATH)
 
 include_directories(
   ${protobuf_source_dir}/gmock
@@ -62,8 +63,10 @@ set(tests_protos
   google/protobuf/util/internal/testdata/field_mask.proto
   google/protobuf/util/internal/testdata/maps.proto
   google/protobuf/util/internal/testdata/oneofs.proto
+  google/protobuf/util/internal/testdata/proto3.proto
   google/protobuf/util/internal/testdata/struct.proto
   google/protobuf/util/internal/testdata/timestamp_duration.proto
+  google/protobuf/util/internal/testdata/wrappers.proto
   google/protobuf/util/json_format_proto3.proto
   google/protobuf/util/message_differencer_unittest.proto
 )