Update to libgit2 v0.22.1.

arthurschreiber · arthurschreiber · commit 974507d13b55 · 2015-02-07T15:23:42.000+01:00
diff --git a/vendor/libgit2 b/vendor/libgit2
@@ -1 +1 @@
-Subproject commit dce7b1a4e75551804a33591744d40d0582c57cfb
+Subproject commit 1ce9ea3ba9b4fa666602d52a5281d41a482cc58b
