Fix typo in cmake/modules/CrossCompile.cmake

[Vedant Kumar via llvm-commits]

It's strange that the 'toolchain' parameter is ignored. I can't find any users of llvm_create_cross_target. Do you know of any?

vedant

> On Jan 21, 2016, at 7:23 PM, Tom Birch via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
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