Fixes cyclical dependency between dojox.gfx.d.ts and dojox.geo.d.ts

Removed reference to dojox.geo.d.ts (dojox.gfx has no actual dependency
on dojox.geo)

dojo/dojox.gfx.d.ts

@@ -4,7 +4,6 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 /// <reference path="dojo.d.ts" />
-/// <reference path="dojox.geo.d.ts" />
 declare module dojox {
     
     /**