Clean up CMake build #3406

Job	Run time
ubuntu-clang-deprecated Debug	22m 7s
ubuntu-clang-deprecated Release	23m 5s
ubuntu-clang-quaternions Debug	22m 54s
ubuntu-clang-quaternions Release	24m 0s
ubuntu-clang-tbb Debug	24m 31s
ubuntu-clang-tbb Release	25m 8s
ubuntu-clang-cayleymap Debug	22m 23s
ubuntu-clang-cayleymap Release	23m 42s
ubuntu-clang-system-libs Debug	23m 2s
ubuntu-clang-system-libs Release	23m 28s
ubuntu-no-boost Debug	22m 56s
ubuntu-no-boost Release	24m 26s
ubuntu-no-unstable Debug	18m 3s
ubuntu-no-unstable Release	19m 7s
	5h 18m 52s

Provide feedback