Bump libgit2 to 9ec6839

vmg · vmg · commit 37f3dd02df72 · 2015-12-17T10:31:14.000+01:00
diff --git a/vendor/libgit2 b/vendor/libgit2
@@ -1 +1 @@
-Subproject commit f824259e674e6fa483f0b6651beff2d82127be6f
+Subproject commit 9ec6839a72db4c013c9bb9da07d37a782bccc7d0
