I discovered that multiple target remote sessions within a single gdb session 
would not reset the fileio state.  This meant that all but the first target 
connection found stdout available for instance.

This patch adds a reset function and calls it when reinitiating remote 
connections.  Tested manually, ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk