Update libgit2
tree2c5b80afda6e62bd667c3f5ee7b37f461a6f12ae
-rw-r--r-- 439 .gitignore
-rw-r--r-- 878 .gitmodules
-rw-r--r-- 224 .mailmap
-rw-r--r-- 231 .tgitconfig
drwxr-xr-x - Languages
-rw-r--r-- 3945 README.md
-rw-r--r-- 2089 appveyor.yml
-rw-r--r-- 6137 architecture.txt
-rw-r--r-- 2615 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