Update libgit2
tree6513bb10d90a87a4cbbfa1367a925b899dd100a5
-rw-r--r-- 429 .gitignore
-rw-r--r-- 762 .gitmodules
-rw-r--r-- 224 .mailmap
-rw-r--r-- 256 .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-- 952 release.txt
drwxr-xr-x - src
drwxr-xr-x - test