sane-backends: version no longer available as single tarball

sane-backends-1.0.23 is only available as three part download. The current version upstream is 1.0.24.

This patch bumps sane-backends to 1.0.24 and refreshes the source patches. This fixes ticket #14579.

Signed-off-by John Vogel <jvogel4@stny.rr.com>