run CMake's own tests to ensure new CMake versions can still build DR

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on October 04, 2011 14:01:42_

CMake 2.8.5 ended up breaking projects that use assemblers. CMake doesn't have very many tests of assemblers and it might be best if we volunteered to run their test suite on one of our bots.

For reference here's the 2.8.5 bug: http://public.kitware.com/Bug/view.php?id=12358 symptoms:
Found assembler: C:/Program Files (x86)/Microsoft Visual Studio 9.0/VC/bin/ml.exe
CMake Error at c:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/CMakeASMInformation.cmake:36 (MESSAGE):
Did not find file Compiler/-ASM
Call Stack (most recent call first):
CMakeLists.txt:683 (enable_language)

I updated HowToBuild .wiki with info on this but to avoid future problems let's set up a bot run.

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=571_