[Cbc] Compile-Fix CBC/CoinUtils

[Christoph Cullmann]

> Christoph,
> 
> %x occurs like that in several places (all for debugging code). Before
> fixing that - is that the only place?
> 
> 2.9 pulls in fixed variant of CoinLpIO.cpp.
Hi,

at least CBC 2.9 build for me here with that fix (and the sprintf fix).

Greetings
Christoph

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