build: fixing a downstream compile error by noting explicit fallthrough (#4265)
build: fixing a downstream compile error by noting explicit fallthrough (#4265)

Signed-off-by: Alyssa Wilk <b9253d1ec9cc3e9d2aab68d288ba3dab3452adf6@chromium.org>
lyft/envoy,lizan/envoy,lyft/envoy,jrajahalme/envoy,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,eklitzke/envoy,eklitzke/envoy,lizan/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy,lyft/envoy,istio/envoy,envoyproxy/envoy,dnoe/envoy,dnoe/envoy,istio/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,lyft/envoy,lizan/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,dnoe/envoy,lizan/envoy,dnoe/envoy,envoyproxy/envoy,dnoe/envoy,eklitzke/envoy,istio/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,lizan/envoy,eklitzke/envoy,lyft/envoy,jrajahalme/envoy,lizan/envoy,istio/envoy,eklitzke/envoy,jrajahalme/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy