[ccan] New module: bdelta

[Joey Adams]

This is a new module for creating deltas between byte strings.  I
wrote it because other diff libraries I looked at, namely libxdiff and
librsync, appeared needlessly difficult to use.

It seems to work really well for strings that differ by a small number
(<=1000) of bytes.  It offers no benefit for strings that differ by
more than that, but this may be improved in a future version by adding
a second algorithm.

It is tested and ready to apply.

- Joey
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