[pkg] windows doesn't have curve

Let's have our own hasCurve() func to don't use curve if is windows.

bitmask/darwin.go

@@ -16,8 +16,16 @@
 
 package bitmask
 
-import "os"
+import (
+	"os"
+
+	"github.com/pebbe/zmq4"
+)
 
 const coreEndpoint = "ipc:///var/tmp/bitmask.core.sock"
 
 var ConfigPath = os.Getenv("HOME") + "/Library/Preferences/leap"
+
+func hasCurve() bool {
+	return zmq4.HasCurve()
+}

bitmask/events.go

@@ -35,7 +35,7 @@ func initEvents() (*zmq4.Socket, error) {
 		return nil, err
 	}
 
-	if zmq4.HasCurve() {
+	if hasCurve() {
 		err = initCurve(socket)
 		if err != nil {
 			return nil, err

bitmask/unix.go

@@ -16,8 +16,16 @@
 
 package bitmask
 
-import "os"
+import (
+	"os"
+
+	"github.com/pebbe/zmq4"
+)
 
 const coreEndpoint = "ipc:///var/tmp/bitmask.core.sock"
 
 var ConfigPath = os.Getenv("HOME") + "/.config/leap"
+
+func hasCurve() bool {
+	return zmq4.HasCurve()
+}

bitmask/windows.go

@@ -21,3 +21,7 @@ import "os"
 const coreEndpoint = "tcp://127.0.0.1:5001"
 
 var ConfigPath = os.Getenv("APPDATA") + "\\leap"
+
+func hasCurve() bool {
+	return false
+}