Switch default build type to gradle (4.0.x only)

bin/templates/cordova/lib/build.js

@@ -320,7 +320,7 @@ function parseOpts(options, resolvedTarget) {
 
     var ret = {
         buildType: 'debug',
-        buildMethod: process.env['ANDROID_BUILD'] || 'ant',
+        buildMethod: process.env['ANDROID_BUILD'] || 'gradle',
         arch: null
     };
 

framework/src/org/apache/cordova/CordovaActivity.java

@@ -21,6 +21,7 @@ package org.apache.cordova;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
+import java.util.Locale;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;