Update libgit2
tree0dff640907cac1711e59ac16f8b153f12f4af571
-rw-r--r-- 429 .gitignore
-rw-r--r-- 679 .gitmodules
-rw-r--r-- 224 .mailmap
-rw-r--r-- 255 .tgitconfig
drwxr-xr-x - Languages
-rw-r--r-- 2878 build.txt
drwxr-xr-x - contrib
drwxr-xr-x - doc
drwxr-xr-x - ext
-rw-r--r-- 958 release.txt
drwxr-xr-x - src
drwxr-xr-x - test