Fix for #20408 - CMake LLVM_ENABLE_FFI=ON build fails on reconfigure

[Josh Klontz]

Ping. CC'ing code owner and release manager.


On Wed, Jul 23, 2014 at 9:11 AM, Josh Klontz <josh.klontz at gmail.com> wrote:

> Testing for the presence of FFI_INCLUDE_PATH cache variable is incorrect
> if cmake is run a second time.
>
> Hopefully this can be applied to 3.5 branch as well. Thanks!
> -Josh
>
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