diff.h: remove unnecessary include of oidset.h

This also made it clear that several .c files depended upon various
things that oidset included, but had omitted the direct #include for
those headers.  Add those now.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/pretty.c b/pretty.c
index 0bb938021b..2cf2cbbd03 100644
--- a/pretty.c
+++ b/pretty.c
@@ -4,6 +4,7 @@
 #include "commit.h"
 #include "environment.h"
 #include "gettext.h"
+#include "hash.h"
 #include "hex.h"
 #include "utf8.h"
 #include "diff.h"