[issue37382] Improve conditional check for test_gdb

[Jeroen Demeyer]

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

> Maybe open an issue to attempt to install gdb on Travis CI?

I created PR 14395 for this.

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