add bare_board variable

[Nathan Sidwell]

This patch adds a bare_board target_info variable to skip a couple of tests that
presume some kind of OS is running.

The start.exp test doesn't work when a gdb stub is being used.

ok?

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

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