[issue37382] Improve conditional check for test_gdb

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> The worst debugging experience is provided by PGO build.

That's true but unrelated to this issue. We already skip test_gdb completely when PGO is enabled.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37382>
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