making submodule into tree
Squashed 'src/libs3-linux/' content from commit 1ffa0b3

git-subtree-dir: src/libs3-linux
git-subtree-split: 1ffa0b3669c1e268f46e47623ca62d7c22d55b67
Merge commit 'a351b80b1870131d1d2428d1671585e3258e6e90' as 'src/libs3-linux'