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)
Well, LLVM_V is 3.5.0… and it’s used in all places apart from clang-3.5 I think.

> Am 10.10.2014 um 11:31 schrieb Vishnu Radomir <notifications@github.com>:
> 
> In devel/llvm/pkg/PLIST:
> 
> >  @bin bin/bugpoint
> >  bin/c++-analyzer
> >  bin/ccc-analyzer
> >  bin/clang
> >  bin/clang++
> > -@bin bin/clang-${LLVM_V}
> > +@bin bin/clang-3.5
> 
> Shouldn't that stay @bin bin/clang-${LLVM_V}?
> 
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