media-gfx/sane-backends: Remove from portage-stable

This was moved into chromiumos-overlay in crrev.com/c/2054925.

BUG=chromium:1052003
TEST=build_packages

Change-Id: I2c2733124d5b2dd8877d9ad8dc4756104cc5a007
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2062176
Tested-by: Benjamin Gordon <bmgordon@chromium.org>
Auto-Submit: Benjamin Gordon <bmgordon@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Benjamin Gordon <bmgordon@chromium.org>
15 files changed