1) Now puts in exactly the same change as the current-cvs mingw code
does. (see
http://cvs.sourceforge.net/viewcvs.py/mingw/runtime/mingwex/dirent.c?r1=
1.3&r2=1.4, second part of the patch).

2) Updates both xlog.c and slru.c in backend/access/transam/

3) Also updates pg_resetxlog, which also uses readdir() and checks the
errno value after the loop.

Magnus Hagander