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mkmf: Log stderr output in xsystem method #6300

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@stanhu stanhu commented Aug 29, 2022

Previously any stderr output used in xsystem would be discarded,
making debugging a little more difficult if something failed. Use
Open3.capture2e instead of IO.popen.

Previously any stderr output used in `xsystem` would be discarded,
making debugging a little more difficult if something failed. Use
`Open3.capture2e` instead of `IO.popen`.
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