[fix] JS into node 10

hooks/after_prepare/061_copy_build_extras.js

 #!/usr/bin/env node
 "use strict";
-var fs = require('fs');
-var glob = require('glob');
-var path = require('path')
+const fs = require('fs'),
+ glob = require('glob'),
+ path = require('path');
 
 // See: https://stackoverflow.com/questions/49162538/running-cordova-build-android-unable-to-find-attribute-androidfontvariation
 
-var rootdir = process.argv[2];
+const rootdir = process.argv[2];
 
 if (rootdir) {
-// go through each of the platform directories that have been prepared
-  var platforms = (process.env.CORDOVA_PLATFORMS ? process.env.CORDOVA_PLATFORMS.split(',') : []);
+  // go through each of the platform directories that have been prepared
+  const platforms = (process.env.CORDOVA_PLATFORMS ? process.env.CORDOVA_PLATFORMS.split(',') : []);
 
-  for (var x = 0; x < platforms.length; x++) {
+  for (let x = 0; x < platforms.length; x++) {
     try {
-      var platform = platforms[x].trim().toLowerCase();
+      const platform = platforms[x].trim().toLowerCase();
 
       if (platform === 'android') {
-        var build_dir = rootdir + '/resources/android/build';
-        var android_dir = rootdir + '/platforms/android';
-        var build_files = build_dir + '/**/*.*';
+        const build_dir = rootdir + '/resources/android/build';
+        const android_dir = rootdir + '/platforms/android';
+        const build_files = build_dir + '/**/*.*';
 
         console.log('-----------------------------------------');
         if (fs.existsSync(android_dir) && fs.existsSync(build_dir)) {
 
-          var mkdirp = function(dir) {
-            var parent = path.dirname(dir);
+          const mkdirp = function(dir) {
+            const parent = path.dirname(dir);
             if (!fs.existsSync(parent)){
               mkdirp(parent);
             }
@@ -37,18 +37,18 @@ if (rootdir) {
           glob(build_files, null, function(er, files) {
             files.forEach(function(file) {
               console.log(' Copy ' + file + ' to ' + android_dir);
-              var dest_file = file.replace(build_dir, android_dir);
+              const dest_file = file.replace(build_dir, android_dir);
               mkdirp(path.dirname(dest_file));
               fs.createReadStream(file).pipe(fs.createWriteStream(dest_file));
             });
           });
 
-          var gradle_file = build_dir + '/build-extras.gradle';
+          const gradle_file = build_dir + '/build-extras.gradle';
           if (!fs.existsSync(gradle_file)) {
             console.log( ' File ' + gradle_file + ' not found. Skipping copy to /platforms/android');
           }
 
-          var signing_file = build_dir + '/release-signing.properties';
+          const signing_file = build_dir + '/release-signing.properties';
           if (!fs.existsSync(signing_file)) {
             console.log( ' File ' + signing_file + ' not found. Skipping copy to /platforms/android');
             console.log( '   WARNING: Release APK files will not be signed !');