Updating libgit2 pointer

slavikus · slavikus · commit abc1d741a4c6 · 2016-03-23T14:20:38.000+03:00
diff --git a/External/libgit2 b/External/libgit2
@@ -1 +1 @@
-Subproject commit c27b4afcdd80f5a45d7120044bf3d78272181abb
+Subproject commit 661db4f4829a0fe1330f275de6e58c34589f512f
