[RFA] Fix all compiler warnings on AIX

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

The attached patch fixes all the compilation warnings on AIX
(which have been aborting the build since -Werror was introduced).

2005-10-27  Joel Brobecker  <brobecker@adacore.com>

        Mostly from Eric Botcazou <botcazou@adacore.com>
        * rs6000-core.c: ANSIfy all function definitions.
        Add missing function prototypes.
        (ptr_to_uint): New type.
        (rs6000coff_core_p): Use it as intermediate step in casts.
        (rs6000coff_core_file_matches_executable_p): Likewise.
        * xcoff-target.h (rs6000coff_core_p): Fix prototype.
        (rs6000coff_core_file_matches_executable_p): Likewise.

Fixes the build failure. Tested on ppc-aix 5.1 by running the
various testsuites first with a version of binutils were rs6000-core
was built without -Werror, and then after having rebuilt it normally
but with the patch applied.

Adding the prototypes is the part I added to Eric's patch. I wasn't
exactly sure where to add them, so I just added them around the begining
of the same file.

OK to apply?

Thanks,
-- 
Joel

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