chore(utils.js): only set maximum stack size on non-win32 machines

Closes angular#4831

Author: petebacondarwin

lib/grunt/utils.js

@@ -190,7 +190,7 @@ module.exports = {
     shell.exec(
         'java ' +
             this.java32flags() + ' ' +
-            '-Xmx2g ' +
+            this.memoryRequirement() + ' ' +
             '-cp bower_components/closure-compiler/compiler.jar' + classPathSep +
             'bower_components/ng-closure-runner/ngcompiler.jar ' +
             'org.angularjs.closurerunner.NgClosureRunner ' +
@@ -217,6 +217,10 @@ module.exports = {
     }.bind(this));
   },
 
+  memoryRequirement: function() {
+    return (process.platform === 'win32') ? '' : '-Xmx2g';
+  },
+
 
   //returns the 32-bit mode force flags for java compiler if supported, this makes the build much faster
   java32flags: function(){