Modified CMake to not offer Doxygen as an option if it isn't there.
Modified CMake to not offer Doxygen as an option if it isn't there.


JohnPJenkins/ROSS,laprej/ROSS-CXX,laprej/ROSS-CXX,JohnPJenkins/ROSS,carothersc/ROSS,carothersc/ROSS,JohnPJenkins/ROSS,laprej/ROSS-CXX,carothersc/ROSS