handle lack of cmakebuildtype better

git-svn-id: https://svn.salilab.org/imp/trunk@16917 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
mark boost random as option

git-svn-id: https://svn.salilab.org/imp/trunk@16918 e91f8c7b-0e32-4433-a9ac-4502d39a4eab