libogg has been added as a hard dependancy

linking libogg dependancy from the `ogg` module is a some clever hack :)
(This is first place I saw `common.gypi`)

Unfortunately it does not works on `heroku`. I tried several combinations. But non of them works. 

So I added libogg as a hard dependancy in libvorbis And it works like a charm.

BTW: I'm not sure, you really need this kind of linking.