[Xcb] Patch for compiler warnings in util-image

[Arnaud Fontaine]

Bart Massey <bart at cs.pdx.edu> writes:

> I'm not OK with accepting compiler warnings. I'm fine with either (a)
> putting in the patches to make the code legal C89, or (b) turning on
> the C99 flag for compilers that need it. If folks want to go with
> option (b), you probably don't want me messing with the autotooling,
> though. :-)  --Bart

Well, option (a) does not make sense IMO because AFAIK the library is
already compiled with C99 flags, so this warning is meaningless, but as
Alan pointed out, it was needed for at least OpenBSD...

Cheers,
-- 
Arnaud Fontaine