Disabled compilation of chat example on windows and mac.
Disabled compilation of chat example on windows and mac.

The new example fails to compile on Windows and Mac so disable it for now.

TBR=wu@webrtc.org,

Review URL: https://webrtc-codereview.appspot.com/1166007

git-svn-id: 3dec5013d1058009ad43391d70f26dc8df6acd9d@293 dd674b97-3498-5ee5-1854-bdd07cd0ff33

volkanh/libjingle,goddino/libjingle,wangscript/libjingle,volkanh/libjingle,wangscript/libjingle,goddino/libjingle,wangscript/libjingle-1,wangscript/libjingle,wangscript/libjingle,jgrowl/libjingle,volkanh/libjingle,goddino/libjingle,lukeweber/libjingle-override,xhook/libjingle,xhook/libjingle,xhook/libjingle,volkanh/libjingle,wangscript/libjingle-1,wangscript/libjingle-1,jgrowl/libjingle,jgrowl/libjingle,xhook/libjingle,wangscript/libjingle-1,volkanh/libjingle,wangscript/libjingle-1,jgrowl/libjingle,lukeweber/libjingle-override,wangscript/libjingle-1,wangscript/libjingle-1,goddino/libjingle,volkanh/libjingle,xhook/libjingle,lukeweber/libjingle-override,lukeweber/libjingle-override,wangscript/libjingle,jgrowl/libjingle,wangscript/libjingle,lukeweber/libjingle-override,goddino/libjingle