[gentoo-dev] USE_EXPAND instead of SANE_BACKENDS for media-gfx/sane-backends

[Patrick Kursawe]

Hi all,

I would like to introduce a new USE_EXPAND variable for the about 80
different SANE backends to make it a bit easier than looking into the
source if you want to find possible backends and a bit harder to pick
invalid backend names. Any objections or questions?

Thanks for your feedback,

Patrick