fix decomp import in Bodies.fromVertices

Author: liabru

src/core/Common.js

@@ -535,19 +535,4 @@ module.exports = Common;
             func
         ));
     };
-
-    /**
-     * Used to require external libraries outside of the bundle.
-     * It first looks for the `globalName` on the environment's global namespace.
-     * If the global is not found, it will fall back to using the standard `require` using the `moduleName`.
-     * @private
-     * @method _requireGlobal
-     * @param {string} globalName The global module name
-     * @param {string} moduleName The fallback CommonJS module name
-     * @return {} The loaded module
-     */
-    Common._requireGlobal = function(globalName, moduleName) {
-        var obj = (typeof window !== 'undefined' ? window[globalName] : typeof global !== 'undefined' ? global[globalName] : null);
-        return obj || require(moduleName);
-    };
 })();

src/factory/Bodies.js

@@ -18,7 +18,6 @@ var Common = require('../core/Common');
 var Body = require('../body/Body');
 var Bounds = require('../geometry/Bounds');
 var Vector = require('../geometry/Vector');
-var decomp;
 
 (function() {
 
@@ -197,11 +196,8 @@ var decomp;
      * @return {body}
      */
     Bodies.fromVertices = function(x, y, vertexSets, options, flagInternal, removeCollinear, minimumArea) {
-        if (!decomp) {
-            decomp = Common._requireGlobal('decomp', 'poly-decomp');
-        }
-
-        var body,
+        var decomp = typeof decomp !== 'undefined' ? decomp : require('poly-decomp'),
+            body,
             parts,
             isConvex,
             vertices,