[patch]: Fix bootstrap/PR 25502: I64d format Werror problem in build

[Kai Tietz]

Hello,

this patch fixes PR/25502 by introducing an optional custom initialization 
routine to c-format.c. I named it TARGET_OVERRIDES_FORMAT_INIT, 
accordingly to the other target macros there. I introduced for mingw 
targets an new warning named -Wpedantic-ms-format. By default it is on for 
32-bit, for 64-bit by default off.

ChangeLog

2008-09-05  Kai Tietz  <kai.tietz@onevision.com>

        Fix PR/25502
        * c-format.c (convert_format_name_to_system_name): Use
        TARGET_OVERRIDES_FORMAT_INIT.
        * config.gcc (extra_options): Add for mingw targets mingw.opt.
        * config/i386/mingw.opt: New.
        * config/i386/mingw32.h (TARGET_OVERRIDES_FORMAT_INIT): New.
        * config/i386/msformat-c.c (TARGET_OVERRIDES_FORMAT_INIT): New.
        (ms_printf_length_specs): Removed const specifier.
        * doc/tm.texi (TARGET_OVERRIDES_FORMAT_INIT): New.

I tested this patch for x86_64-pc-mingw32. Is this patch ok for apply?

Cheers,
Kai

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