cmake: Support cmake v2.8.9
Hi,
We have an issue compiling with CMake on our Debian7 machines where CMake 2.8.9 is installed.
We get the following error:
```
CMake Error at cpp_test_suite/CMakeLists.txt:10 (cmake_host_system_information):
Unknown CMake command "cmake_host_system_information".
```
issue