[PATCH] show-diff.c: do not include unused header file

This is my bad.  I added #include <ctype.h> to the file,
which I ended up not using and failed to remove it.

Signed-off-by: Junio C Hamano <redacted>
---

show-diff.c: d85d79b97a59342390bd34da09049dd58d56900f

--- show-diff.c
+++ show-diff.c	2005-04-16 22:37:29.000000000 -0700

@@ -4,7 +4,6 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 #include "cache.h"
-#include <ctype.h>
 
 static char *diff_cmd = "diff -L '%s' -u -N  - '%s'";