COMP: Flags must be a single string in CosmoTools

Make compiler flags to be a single string in the cmake
build of cosmotools to resolve issues with building cosmotools
within the ParaView superbuild.
COMP: Flags must be a single string in CosmoTools

Make compiler flags to be a single string in the cmake
build of cosmotools to resolve issues with building cosmotools
within the ParaView superbuild.

From: George Zagaris <george.zagaris@kitware.com>

git-svn-id: https://svn.alcf.anl.gov/repos/DarkUniverse/hacc/trunk/cosmotools@1642 952bdfbe-fa2e-45c0-a9ae-ac90d4a62daf
Merge branch 'svn/trunk'