Replace NEKit dependency with reduced subset

GlassVPN/zhuhaow-NEKit/Socket/AdapterSocket/SecureHTTPAdapter.swift

@@ -0,0 +1,9 @@
+import Foundation
+
+/// This adapter connects to remote host through a HTTP proxy with SSL.
+public class SecureHTTPAdapter: HTTPAdapter {
+    override public init(serverHost: String, serverPort: Int, auth: HTTPAuthentication?) {
+        super.init(serverHost: serverHost, serverPort: serverPort, auth: auth)
+        secured = true
+    }
+}