Squashed 'cmake_modules/' content from commit a69e3d0

git-subtree-dir: cmake_modules
git-subtree-split: a69e3d0b889863658476e205a75e90233e591bd6
Merge commit '9415146afb966d17d5b21896e23614b262b19bee' as 'cmake_modules'
Use cmake_modules for def_library.