[all] fixes for windows

haxetool/sdk.js

@@ -9,32 +9,6 @@ const progress = require('cli-progress');
 const fse = require('fs-extra');
 const Log = require('./log');
 
-
-class System {
-
-    static get isWindows() {
-        return os.type() === 'Windows_NT';
-    }
-
-    static get isLinux() {
-        return os.type() === 'Linux';
-    }
-
-    static get archInt() {
-        if (os.arch() === 'ia32') return 32;
-        if (os.arch() === 'x64') return 64;
-    }
-
-    static get isArch32() {
-        return this.archInt === 32;
-    }
-
-    static get isArch64() {
-        return this.archInt === 64;
-    }
-}
-
-
 class Downloader {
 
     static createProgressBar() {
@@ -151,6 +125,5 @@ class Sdk {
 }
 
 Sdk.Downloader = Downloader;
-Sdk.System = System;
 
 module.exports = Sdk;