windows: really stop using legacy stdio during test runs
I realized that the test runner also sets this, because a lot of the test modules also do stdio in bytes, so setting this in the runner fixed a lot of failures. We'll have to port whatever fix is made to hg itself to all of the needed places in the test modules (and we can make this smarter by only conditionally clearing it if a couple of test variables are also set), but for now, keep it simple.
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