Using newer autoconf in src/winsup directory

[Danny Smith]

RE: http://cygwin.com/ml/cygwin-patches/2006-q2/msg00051.html

I am not subscribed to cygwin-patches so I'm posting here.  Forgive me
if I've transgressed boundares, but I've always considered mingw as a
cygwin-dependent app.

Applying the above patch, running aclocal and then autoconf-2.5x, then
./configure ---host=mingw32 --target=mingw32 works for mingw and w32api
subdirs from a cygwin bash shell.

I haven't tried with msys tools since I don't have them.

Danny