Cannot build fstat.c on mingw

[Reuben Thomas]

I get an error with compiling:

In file included from fstat.c:52:
stat-time.h: In function ‘get_stat_atime_ns’:
stat-time.h:52:43: error: invalid use of undefined type ‘const struct _stati64’
   52 | #  define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim)

and lots more the same.

I came across this when trying to build GNU libiconv 1.17, which seems to use the current version of fstat.c.

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