fix index-pack with packs >4GB containing deltas on 32-bit machines

This probably hasn't been properly tested before.  Here's a script to
create a 8GB repo with the necessary characteristics (copy the
test-genrandom executable from the Git build tree to /tmp first):

-----
#!/bin/bash

git init
git config core.compression 0

# create big objects with no deltas
for i in $(seq -w 1 2 63)
do
	echo $i
	/tmp/test-genrandom $i 268435456 > file_$i
	git add file_$i
	rm file_$i
	echo "file_$i -delta" >> .gitattributes
done

# create "deltifiable" objects in between big objects
for i in $(seq -w 2 2 64)
do
	echo "$i $i $i" >> grow
	cp grow file_$i
	git add file_$i
	rm file_$i
done
rm grow

# create a pack with them
git commit -q -m "commit of big objects interlaced with small deltas"
git repack -a -d
-----

Then clone this repo over the Git protocol.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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