r189406 - CMake: Fix standalone Clang build, take two.

[Jordan Rose]

On Aug 27, 2013, at 15:56 , Stephen Kelly <steveire at gmail.com> wrote:

> Jordan Rose wrote:
> 
>> This time, use a variable that's defined consistently in standalone and
>> non-standalone builds.
> 
> Note that with a future CMake release, you'll be able to simplify this 
> further:
> 
> http://www.cmake.org/pipermail/cmake-commits/2013-August/016048.html

Nice. I don't know if we want to bump our minimum CMake version requirement, though.

Jordan