fix(nmf): Fix exports for var injection to include free glob exports or arguments

Author: TheLarkInn

lib/NormalModule.js

@@ -270,10 +270,9 @@ NormalModule.prototype.source = function(dependencyTemplates, outputOptions, req
 
 			var emitFunction = function emitFunction() {
 				if(varNames.length === 0) return;
-
 				varStartCode += "/* WEBPACK VAR INJECTION */(function(" + varNames.join(", ") + ") {";
 				// exports === this in the topLevelBlock, but exports do compress better...
-				varEndCode = (topLevelBlock === block ? "}.call(exports, " : "}.call(this, ") +
+				varEndCode = (topLevelBlock === block ? "}.call(module.exportsArgument || 'exports', " : "}.call(this, ") +
 					varExpressions.map(function(e) {
 						return e.source();
 					}).join(", ") + "))" + varEndCode;