Fix building for Linux targets.

Fixes icedream#1.

listener.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"math/rand"
 	"net"
-	"syscall"
 	"time"
 )
 
@@ -41,13 +40,6 @@ var stagelinqDiscoveryBroadcastAddress = &net.UDPAddr{
 
 var magicBytes = []byte("airD")
 
-func setSocketControlForReusePort(network, address string, c syscall.RawConn) error {
-	return c.Control(func(fd uintptr) {
-		syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
-		syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
-	})
-}
-
 // Listener listens on UDP port 51337 for StagelinQ devices and announces itself in the same way.
 type Listener struct {
 	softwareName    string

listener_nonwindows.go

@@ -0,0 +1,12 @@
+//+build !windows
+
+package stagelinq
+
+import "syscall"
+
+func setSocketControlForReusePort(network, address string, c syscall.RawConn) error {
+	return c.Control(func(fd uintptr) {
+		syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
+		syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
+	})
+}

listener_windows.go

@@ -0,0 +1,12 @@
+//+build windows
+
+package stagelinq
+
+import "syscall"
+
+func setSocketControlForReusePort(network, address string, c syscall.RawConn) error {
+	return c.Control(func(fd uintptr) {
+		syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
+		syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
+	})
+}