commit.h: reduce unnecessary includes

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/parse-options.c b/parse-options.c
index b680364..f8a155e 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -5,6 +5,7 @@
 #include "commit.h"
 #include "color.h"
 #include "gettext.h"
+#include "strbuf.h"
 #include "utf8.h"
 
 static int disallow_abbreviated_options;