[patch/obv] Skip gdb.trace/status-stop.exp if target doesn't support trace

[Yao Qi]

I noticed that gdb.trace/status-stop.exp is run on target that doesn't
support tract at all.  Like other test cases in gdb.trace,
gdb_target_supports_trace should be called first to check target
supports trace or not, which is missing in gdb.trace/status-stop.exp.
This patch is to check gdb_target_supports_trace first, like other
gdb.trace tests.

It is obvious.  Committed.

-- 
Yao (齐尧)
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