Update generated_message_table_driven.h (#8571)

Export SerializeInternalToArray referenced by TableSerializeToArray
diff --git a/src/google/protobuf/generated_message_table_driven.h b/src/google/protobuf/generated_message_table_driven.h
index 0f6309a..def4a1f 100644
--- a/src/google/protobuf/generated_message_table_driven.h
+++ b/src/google/protobuf/generated_message_table_driven.h
@@ -263,7 +263,7 @@
   SerializeInternal(base, field_table + 1, num_fields, output);
 }
 
-uint8* SerializeInternalToArray(const uint8* base, const FieldMetadata* table,
+PROTOBUF_EXPORT uint8* SerializeInternalToArray(const uint8* base, const FieldMetadata* table,
                                 int32 num_fields, bool is_deterministic,
                                 uint8* buffer);