fix compile if OS doesn't support IPV6_TRANSPARENT (#12956)
fix compile if OS doesn't support IPV6_TRANSPARENT (#12956)

Signed-off-by: Bill Gallagher <d96deba51d665458496e33bd955b2edf36843d73@lyft.com>
envoyproxy/envoy-wasm,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,lyft/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy