Using newer autoconf in src/winsup directory

[Steve Ellcey]

I have been working to move the src tree at soureware.org to a newer
version of autoconf.  The reason for this is so that we can, in turn,
move to a newer version of libtool.  Would it be possible to rebuild the
configure scripts in src/winsup with a recent version of autoconf, like
autoconf 2.59?  Most parts of the src tree have already moved to this
version.

Steve Ellcey
sje@cup.hp.com