don't reference SIGUSR1 on windows (#2018)

irc/utils/signals.go

@@ -1,5 +1,4 @@
-//go:build !plan9
-// +build !plan9
+//go:build !plan9 && !windows
 
 // Copyright (c) 2020 Shivaram Lingamneni
 // released under the MIT license

irc/utils/signals_plan9.go

@@ -1,5 +1,4 @@
 //go:build plan9
-// +build plan9
 
 // Copyright (c) 2020 Shivaram Lingamneni
 // released under the MIT license

irc/utils/signals_windows.go

@@ -0,0 +1,23 @@
+//go:build windows
+
+// Copyright (c) 2020 Shivaram Lingamneni
+// released under the MIT license
+
+package utils
+
+import (
+	"os"
+	"syscall"
+)
+
+var (
+	// ServerExitSignals are the signals the server will exit on.
+	ServerExitSignals = []os.Signal{
+		syscall.SIGINT,
+		syscall.SIGTERM,
+		syscall.SIGQUIT,
+	}
+
+	// no SIGUSR1 on windows
+	ServerTracebackSignals []os.Signal
+)