[PATCH] [compiler-rt] Port add_sanitizer_rt_symbols to CMake 3.0

[Brad King]

Hi Folks,

I tested building compiler-rt with the upcoming CMake 3.0 release and
encountered warnings related to a new policy CMake 3.0 introduces.
Here is a pair of (ordered) patches to make it configure and build
cleanly both with CMake 3.0 and with CMake 2.8.x versions.

The first patch fixes an existing problem (for any CMake version)
with multi-configuration CMake generators like the VS IDE and Xcode.
The second patch addresses the CMake 3.0 warning and also simplifies
the fix in the first patch when using CMake 3.0 by taking advantage
of a new feature.

Please see the commit message in each patch for full details.

Thanks,
-Brad

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