Switch url to upstream source repository, as "website" has continuously
broken TLS and this way we can reuse url in source array.
Switch to correct SPDX license identifiers for upstream project.

Signed-off-by: David Runge <dvzrv@archlinux.org>

Rebuild to add sane-airscan to optdepends as it is needed for driverless scanning:
https://bugs.archlinux.org/task/78391
Add libjpeg-turbo as direct dependency.

Sort the find output used to populate the backup array.
Copy translation files for translations without specific .po file:
https://gitlab.com/sane-project/backends/-/issues/647

Remove unnecessary quotes and curly braces.
Consolidate dependencies.
Use arrays with entries per line to track dependencies and configure options.

Simplify quoting in file.

Disable the potentially dangerous testing feature pnm-backend.
Disable locking, as the detection of groups does not work in the build environment.
Remove unused libglib-2.0.so dependency.
Remove old changelog files.

Rename the saned@.service to saned.service, because svn is silly and has
issues with @ in file names.
Manipulate libtool after configure to circumenvent overlinking of libraries.

Switch to auto-generated upstream tarballs for more predictable links.
Remove xinetd integration.
Rework systemd service to be based on the separate user/group 'saned'.
Add udev rule to grant rw access to USB devices for the 'saned' group (using ACLs).
Generate required version files to be used by autotools macros.
Run autoreconf in prepare().
Switch to current and explicit use of options in the configure call.
Enable locking of devices for simultaneous access.
Add libsystemd.so and libtiff.so to depends in package().
Replace the use of plain udev rules by udev+hwdb integration (per upstream suggestion).
Remove explicit installation of pkgconfig integration (make install does that).
Remove unexplained fix for HP OfficeJets.
Populate backup array in package() via find call to not be required to manually
add an increasing amount of configuration files to the backup array.
https://bugs.archlinux.org/task/68062
https://bugs.archlinux.org/task/57391
https://bugs.archlinux.org/task/68529

Switch to correct license (GPL2).
Add all available sodeps in package() and the respective packages to makedepends.
Add all otherwise directly linked packages to depends.
Add libsane.so to provides.
Update contributor info.