bpo-46263: Do not ever expect "use_frozen_modules" to be -1. #30438
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The check was added in gh-28940 (f1d3878 specifically) as a workaround in response to some buildbot failures. However, gh-29041 (for https://bugs.python.org/issue45582) made improvements to the "getpath" logic. Now a default "use_frozen_modules" is always set. So we can drop the workaround in the test.
This should resolve the buildbot failure on FreeBSD.
https://bugs.python.org/issue46263