Update libgit2
tree49d057e3ec1b5c24ced9d88fb4b41b104615e47b
-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-- 952 release.txt
drwxr-xr-x - src
drwxr-xr-x - test