[libgfortran,patch] Use __mingw_snprintf instead of snprintf when possible

[François-Xavier Coudert]

> No technically its not a regression. gfortran was never useable on mingw
> unless patched.

I meant it's a regression wrt g77.

> I don't have resources to devote to both 4.2.2 and 4.3.0.  4.3 is
> definitely more important to me
>
> I perceive gcc-4.2 as a preview of 4.3. 4.3 may be the real thing for
> mingw.  Judging by the bug reports that an experimental mingw 4.2.1
> release (with some 4.3 backports) has stimuluted, I still think there is
> a lot of work to get a stable 4.x mingw.

OK. Seeing you had released 4.2.1 candidates, I thought you wanted to
make the 4.2 branch the next mingw compiler. If you focus on 4.3, it's
all good for gfortran, which is still evolving fast and thus lots
better in every newer release! ;-)

If, among the bugs reports you get for your 4.2.1 release, there are
gfortran-related bugs, please let me know. I'm really interested in
getting gfortran as good on mingw as it is elsewhere.

FX