bdiff stack overflow patch

[Alistair Bell]

Hi all,

As mentioned in http://mercurial.selenic.com/bts/issue1940 I found
that I was getting a stack overflow in bdiff. You could possibly blame
GCC 3.4.6 for not recognizing that it should optimize the code as tail
recursion, but I converted the tail recursion to iteration and the
problems went away.

Patch is attached.

Alistair
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