[oe] Please don't remove recipes that have PREFERRED_VERSION set on them, e.g. tiff

[Koen Kooi]

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Hi,

conf/distro has:

../conf/distro/include/kaeilos-2009-preferred-versions.inc:49:PREFERRED_VERSION_tiff
           = "3.8.2+4.0.0beta2"
../conf/distro/include/preferred-om-2009-versions.inc:25:PREFERRED_VERSION_tiff
         = "3.8.2+4.0.0beta2"
../conf/distro/include/angstrom-2008-preferred-versions.inc:47:PREFERRED_VERSION_tiff
          = "3.8.2+4.0.0beta2"

And that version was removed this morning without any warning. Would
people please stop doing that?
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