conflicting gettimeofday with MinGW

mingw-runtime-3.10 introduced a gettimeofday declaration in sys/time.h
that is not compatible with port.h.
(current is mingw-runtime-3.12)

int __cdecl gettimeofday(struct timeval *__restrict__,
void *__restrict__ /* tzp (unused) */);

The problem was already reported by Marc Lepage on June 26, 2006 shortly
after the mingw-runtime release,
(He reported back that it was a MinGW installation issue. But it is a
version issue.).

Now, we could probably make a case that MinGW needs to use "struct
timezone" instead of void,
but that change alone still does not make pg compile, because of the
"#define TIMEZONE_GLOBAL timezone"
in port.h.

Any opinions on how to proceed ?

Andreas