cmd/chihaya: make things work on windows

cmd/chihaya/signal_unix.go

@@ -0,0 +1,15 @@
+// +build darwin freebsd linux netbsd openbsd dragonfly solaris
+
+package main
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func makeReloadChan() <-chan os.Signal {
+	reload := make(chan os.Signal)
+	signal.Notify(reload, syscall.SIGUSR1)
+	return reload
+}