test actual requires from useBuiltIns (#95)

* test actual requires from useBuiltIns

* only run on npm 3 for now

experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-all-exec/exec.js

@@ -0,0 +1,3 @@
+if (parseInt(process.version.slice(1)) > 5) {
+  require('babel-polyfill');
+}

experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-all-exec/options.json

@@ -0,0 +1,7 @@
+{
+  "presets": [
+    ["../../../../lib", {
+      "useBuiltIns": true
+    }]
+  ]
+}

experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-all/actual.js

@@ -1,2 +1 @@
 import "babel-polyfill";
-1 ** 2;

experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-all/expected.js

@@ -84,5 +84,3 @@ import "core-js/modules/web.timers";
 import "core-js/modules/web.immediate";
 import "core-js/modules/web.dom.iterable";
 import "regenerator-runtime/runtime";
-
-Math.pow(1, 2);