Squashed 'thirdparty/ck/' content from commit 4af7571

git-subtree-dir: thirdparty/ck
git-subtree-split: 4af7571990713e481d85394707ad3395df736c6a
Merge commit '72d5dffb2726ec30e3e879c3ad9340dec965ad22' as 'thirdparty/ck'