Nukes old cmake_modules.
Squashed 'CMakeModules/' content from commit 8865abd

git-subtree-dir: CMakeModules
git-subtree-split: 8865abdd0b6e7937c23b8587e44151fa845f924e
Merge commit '55401f42b2be0231fa19f991164f0e08516e5296' as 'CMakeModules'
Look for new CMakeModules.