[committed][gdb/testsuite] Make gdb.base/dbx.exp more robust

[Tom de Vries]

[ was: Re: [PATCH 3/3][gdb/testsuite] Warn about leaked global array ]

On 04-06-2020 13:40, Tom de Vries wrote:
>> BTW, global variables alone aren't the full scope of the
>> bleeding between testcases.  There's also the case of
>> testcases overriding procedures, like gdb.base/dbx.exp,
>> but those are perhaps rare enough that we can continue
>> handling it "manually" as before.
> AFAICT, that test-case does an effort to undo the override, though I'm
> not sure how certain it is that the undo will be executed.

I've committed patch below to make sure the undo is executed (and
similar for GDBFLAGS).

Thanks,
- Tom
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