[PATCH] Two macOS UX improvements

[Filippo Valsorda]

Two simple patches: one drops using ImageMagick to show the QR, as that
involves XQuartz and the UTF-8 QRs work great, and the other shaves more
than 2s (!!) from every invocation by not running "brew --prefix" if the
prefix is the default one.

0001-platform-darwin-drop-using-display-to-show-QR-codes.patch
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0002-platform-darwin-don-t-invoke-brew-for-the-default-pr.patch

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