Rename builder esprima fixtures to babel

f724ae98a1 changed the build
script to use Babel, so this commit updates the file names accordingly

external/builder/fixtures_babel/evals-expected.js

@@ -0,0 +1,21 @@
+var a = false;
+var b = true;
+var c = true;
+var d = false;
+var e = true;
+var f = "text";
+var g = {
+  obj: {
+    i: 1
+  },
+  j: 2
+};
+var h = {
+  test: "test"
+};
+var i = '0';
+var j = {
+  i: 1
+};
+var k = false;
+var l = true;