Add 'include/subrepo2/' from commit '35cc4225ef5b42655dd4adc013ed9741c4f733c2'

git-subtree-dir: include/subrepo2
git-subtree-mainline: 8225d95a2193fe641828c58e41c4a77d8ecc7fcc
git-subtree-split: 35cc4225ef5b42655dd4adc013ed9741c4f733c2