diff: fix "git show -C -C" output when renaming a binary file

A bug was introduced in 3e97c7c6af
(No diff -b/-w output for all-whitespace changes, Nov 19 2009)
that made the lines:

  diff --git a/bar b/sub/bar
  similarity index 100%
  rename from bar
  rename to sub/bar

disappear from "git show -C -C" output when file bar is a binary
file.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4043-diff-rename-binary.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+#
+# Copyright (c) 2010 Jakub Narebski, Christian Couder
+#
+
+test_description='Move a binary file'
+
+. ./test-lib.sh
+
+
+test_expect_success 'prepare repository' '
+	git init &&
+	echo foo > foo &&
+	echo "barQ" | q_to_nul > bar &&
+	git add . &&
+	git commit -m "Initial commit"
+'
+
+test_expect_success 'move the files into a "sub" directory' '
+	mkdir sub &&
+	git mv bar foo sub/ &&
+	git commit -m "Moved to sub/"
+'
+
+cat > expected <<\EOF
+ bar => sub/bar |  Bin 5 -> 5 bytes
+ foo => sub/foo |    0
+ 2 files changed, 0 insertions(+), 0 deletions(-)
+
+diff --git a/bar b/sub/bar
+similarity index 100%
+rename from bar
+rename to sub/bar
+diff --git a/foo b/sub/foo
+similarity index 100%
+rename from foo
+rename to sub/foo
+EOF
+
+test_expect_success 'git show -C -C report renames' '
+	git show -C -C --raw --binary --stat | tail -n 12 > current &&
+	test_cmp expected current
+'
+
+test_done