[testsuite, committed] skip gdb.mi/mi-threads-interrupt.exp if nointerrupts

[Sandra Loosemore]

I've checked in this patch to skip gdb.mi/mi-threads-interrupt.exp if 
there's no interrupt support in the configuration being tested.  We've 
run into this in our Windows-host GDB testing, in particular; without 
using Cygwin to intercept ^C,

send_gdb "\003"

fails to do anything to stop the target, so remaining tests just time out.

The added check was copied directly from gdb.base/interrupt.exp and 
there are already several other tests that are skipped for this reason 
too, so I think this patch qualifies as obvious.

-Sandra



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