spurious "closing protected handle" messages

[Christopher Faylor]

I've noticed that cygwin is giving me a lot of "closing protected handle" messages
when telnetting to my windows system.

This is due to the recent changes in calling close_all_files and my change to stop
duplicating handles in a close-on-exec situation.

The warnings are, I think, bogus but fixing them will be hard.

Just in case anyone had noticed this...

cgf