Add a ValidateBuild.cmake script that runs after the Trilinos
dashboard run is complete. In that script, look for some expected
Trilinos executable files. Run the basic Teuchos unit tests
executable and expect it to return 0 for no errors.
Also, patch the main CMakeLists.txt file to get rid of new warnings
from CMake when variables passed in on the command line go
un-referenced in the CMakeLists processing.