[PATCH] cmake: Remove check for files not in build list.

[Duncan P. N. Exon Smith]

This looks like it matches our consensus, but I'm not entirely
comfortable signing off on cmake stuff.  Can any build gurus take a look
at this and confirm it does what the comment says?

> On 2014 Sep 2, at 12:29, Matt Arsenault <Matthew.Arsenault at amd.com> wrote:
> 
> Ping
> 
> http://reviews.llvm.org/D4581
> 
> 
> 
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