sane : moved unused files to obsolete dir

Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>

diff --git a/recipes/sane/sane-backends-1.0.19/sane-plustek.patch b/recipes/obsolete/sane/sane-backends-1.0.19/sane-plustek.patch
similarity index 100%
rename from recipes/sane/sane-backends-1.0.19/sane-plustek.patch
rename to recipes/obsolete/sane/sane-backends-1.0.19/sane-plustek.patch