Initial attempt at clang 3.5 port

Hi,

I took Dale's commit and fixed a few things. The port compiles and packages fine.

(This continues Pull Request https://github.com/bitrig/bitrig-ports/pull/49)
In 3.4, we had stuff in the Fragments. But now that the clang_rt library was renamed(?) it’s all in the PLIST. Not sure how it should look like though.

> Am 10.10.2014 um 11:30 schrieb Vishnu Radomir <notifications@github.com>:
> 
> In devel/llvm/pkg/PLIST:
> 
> > @@ -1,10 +1,14 @@
> > -@comment $OpenBSD: PLIST,v 1.21 2014/04/18 09:30:48 brad Exp $
> > +@comment $OpenBSD$
> > +%%amd64%%
> > +%%i386%%
> 
> i386 again. Do we need the empy fragments at all?
> 
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