revision: include object-name.h

The REV_INFO_INIT macro includes a use of the DEFAULT_ABBREV macro, which is
defined in object-name.h. Include it in revision.h so consumers of
REV_INFO_INIT do not need to include this hidden dependency.

Signed-off-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

revision.h

@@ -4,6 +4,7 @@
 #include "commit.h"
 #include "grep.h"
 #include "notes.h"
+#include "object-name.h"
 #include "oidset.h"
 #include "pretty.h"
 #include "diff.h"