windows: remove preprocessor business for [v]snprintf
windows: remove preprocessor business for [v]snprintf

https://github.com/warmcat/libwebsockets/issues/731
sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets