const vendor/golang.org/x/net/route.sizeofIfDataDarwin15

one use

	vendor/golang.org/x/net/route (current package)
		zsys_darwin.go#L89: 	sizeofIfDataDarwin15      = 0x60

The pages are generated with Golds v0.2.8-preview. (GOOS=darwin GOARCH=arm64)