upstream patches that aren't upstream patches

[Harald Sitter]

http://anonscm.debian.org/cgit/pkg-kde/kde-std/sddm.git/tree/debian/patches/upstream_add-graphical.target.diff?h=kubuntu_vivid_archive

is not upstream but the prefix suggests it is, while in fact it was
rejected upstream

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https://github.com/sddm/sddm/pull/340

Only use upstream_ for patches from upstream, use some other
identifier or call the patch kubuntu_ if the patch does not come from
upstream's SCM.

Also, sddm has way too many patches Oo

HS