adjust watchpoint testing

[Nathan Sidwell]

the recurse.exp test presume there are at least two hardware watchpoints.  This
patch adds a gdb,hardware_watchpoint target info variable and adjust the test to
only test where two watchpoints are used, if they exist on the target.

I found it necessary to adjust the watchpoint.exp expected reply too.

ok?

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

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