AC_LIBTOOL_WIN32_DLL for libgfortran

[FX Coudert]

> In any case, I think efforts would be better spent helping get a  
> modern
> libtool into the tree, since the one there now is ancient and I  
> wouldn't
> be surprised if the mingw/cygwin-specific parts have bitrotted from
> years of neglect.

There is effort to get that done, as you can see in the recent (few  
days ago) thread starting here:
http://gcc.gnu.org/ml/gcc/2007-03/msg00293.html

Please feel free to step into this other discussion and help/give  
advice about how achieve this goal.

> For example, this AC_LIBTOOL_WIN32_DLL macro was
> removed/deprecated from libtool three years ago.

What should be used with a recent libtool? And where is it documented?

FX