Fix legacy Windows :platform values no longer working
#8482
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What was the end-user or developer problem that led to this PR?
#8428 created a regression when using legacy
mingwplatform values in Gemfile. One spec would've caught the issue, because there was an issue in the RSpec filter it was using, so the spec was being skipped.What is your fix for the problem, implemented in this PR?
The fix is to make sure the legacy values are still matched after the changes in #8428 by mapping them to
universal-mingwas well. I also fixed the filter to catch this kind of issue in the future.Make sure the following tasks are checked