remove luajit-2.0 (as it does not follow git subtree anymore)
Squashed 'luajit-2.0/' content from commit a31c317

git-subtree-dir: luajit-2.0
git-subtree-split: a31c317fb59964be6ab4414fbaea4abebef1c0f5
Merge commit 'b79f96e2f7b03d7a4cb9b9638d21f1c64d4fcaa3' as 'luajit-2.0'
added readline support for luajit 2.0
added cmake files for luajit 2.0
Squashed 'luajit-2.1/' changes from d6ff3af..42ed4e5

42ed4e5 Merge branch 'master' into v2.1
a31c317 FFI: No meta fallback when indexing pointer to incomplete struct.

git-subtree-dir: luajit-2.1
git-subtree-split: 42ed4e53a525cdd763b3707f6c41d5bd9ec92689
Merge commit '0f5edb29dbfe0468f699f5e8ff7595aee0701fcb'