fix build failed on windows (#99)

Using the current default configuration, build failed on Windows.

Author: wuwen5

.bazelrc

@@ -2,5 +2,6 @@ build --enable_platform_specific_config
 build --features=-supports_dynamic_linker
 build --cxxopt=-std=c++17
 build:windows --cxxopt=-std:c++17
+build:windows --copt=/wd4716
 
 try-import %workspace%/user.bazelrc