Update git to v1.7.8.6

No changes required.

Signed-off-by: John Keeping <john@keeping.me.uk>

diff --git a/git b/git
index 8258858493ad3504630c3bfa7dfde61df811994a..d9f5ef7a4a760d58f1f824f9fb8c12ef0371d3a9 160000 (submodule)
--- a/git
+++ b/git
@@ -1 +1 @@
-Subproject commit 8258858493ad3504630c3bfa7dfde61df811994a
+Subproject commit d9f5ef7a4a760d58f1f824f9fb8c12ef0371d3a9