Want to auto_view html, but try text/plain first

[Manish Rai Jain]

unalternative_order * doesn't help. The problem is that, mutt always
renders html (in my case, it gets sent to chrome which introduces a delay)
via mailcap, if I set text/html in auto_view. I only want html mailcap to
be invoked, if text/plain isn't present.
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