Use same options for libgit2 diff as for libgit diff
treef7ed54d0d8544d07d023cabe4f04ddb8b5b54d9c
-rw-r--r-- 600 .gitignore
-rw-r--r-- 1065 .gitmodules
-rw-r--r-- 700 .mailmap
-rw-r--r-- 231 .tgitconfig
drwxr-xr-x - Languages
-rw-r--r-- 3975 README.md
-rw-r--r-- 2323 appveyor.yml
-rw-r--r-- 6138 architecture.txt
-rw-r--r-- 3463 build.txt
drwxr-xr-x - contrib
drwxr-xr-x - doc
drwxr-xr-x - ext
-rw-r--r-- 1261 release.txt
drwxr-xr-x - src
drwxr-xr-x - test