sbuild breaks lp-buildd with symlinks to .dsc files

The changelog entry that introduces this changes says: abs-path-revert.patch: Revert upstream commit that breaks lp-buildd by causing symlinks to files not ending in .dsc to no longer be buildable.

I was able to reproduce the problem:

pull-debian-source -d distro-info 1.1
mv distro-info_1.1.dsc distro-info_1.1_with_diffent_ending.txt
ln -s distro-info_1.1_with_diffent_ending.txt distro-info_1.1.dsc
sbuild -d unstable distro-info_1.1.dsc

abs_path() expands jobname from 'distro-info_1.1.dsc' to '/full/path/to/distro-info_1.1_with_diffent_ending.txt'. Then it tries to fetch that source file (instead of using it as dsc file).

This bug was fixed in the package sbuild - 0.83.1ubuntu1

---------------
sbuild (0.83.1ubuntu1) kinetic; urgency=medium

  * Merge from Debian unstable (LP: #1974177). Remaining changes:
    - d/t/control: add isolation-machine to the test flags
    - no-pkg-mangle-deps.patch: Set NO_PKG_MANGLE=1 when building dummy
      packages, as pkgbinarymangler's dpkg-deb expects to be run from a source
      package.
    - abs-path-revert.patch: Revert upstream commit that breaks lp-buildd by
      causing symlinks to files not ending in .dsc to no longer be buildable.
      (LP: #1976257)
    - debian/tests/control: Skip unshare-qemuwrapper test where linux-image-
      amd64 is missing. It is missing in Ubuntu making the test fail.
    - debian/tests/unshare: Run the test, but skip it if user namespaces are
      not supported
    - debian/tests/unshare*: Test with current release
  * Removed obsolete patches/changes:
    - debian/tests/control: Don't depend on linux-image-amd64 package
      It does not exist on Ubuntu.
    - debian/tests/unshare-qemuwrapper: Don't use linux-image-amd64 package in
      bootrstrapping test on Ubuntu
    - debian/tests/unshare-qemuwrapper: Drop delta
  * Fix the unshare tests
    - Make dscverify available by adding devscripts to EXTRA_DEPS
    - Ensure dscverify tests actually run by re-writing verify()
    - Remove the release=unstable check (there's no reason we shouldn't
      check the orig-tarball and deb output)
    - unshare test requires isolation-machine to execute
  * Fix build-procenv to work under Ubuntu by removing unstable deb-src
    reference
  * Fix the diffoscope tests
    - Change the expected .deb output to match xz or zstd compression
    - Use "unstable" as d/changelog release name so the test can remain
      static across releases
    - Patch umask differences otherwise diffoscope barfs on differing group
      modes in the generated orig-tar

sbuild (0.83.1) unstable; urgency=medium

  [ Johannes Schauer Marin Rodrigues ]
  * bin/sbuild-cross-resolver: we don't need the English module (closes:
    #1005957)
  * debian/tests/unshare: run with -x
  * lib/Sbuild/Utility.pm: add warning about missing libwww-perl (closes:
    #1009859)

  [ Jochen Sprickerhof ]
  * lib/Sbuild/ChrootUnshare.pm: mkdir for bind mounts

  [ Daniel Kahn Gillmor ]
  * Use --batch with gpg when importing secret key (Closes: #1010171)

sbuild (0.83.0) unstable; urgency=medium

  * sbuild-qemu (package):
    - Support for new architectures: armhf, arm64, ppc64el
    - Move vmdb2 to Depends
    - Depend on autopkgtest (>= 5.17~)
  * sbuild-qemu:
    - Fix looking for images when --arch was specified
    - sbuild-qemu: rename --ram to --ram-size. This matches the
      autopkgtest-virt-qemu option
    - Reduce default CPU count to 2, rather than equal to host cores. This is
      more likely to work on all platforms
  * sbuild-qemu-create:
    - Update shared dir setup (deprecated QEMU syntax). Existing images will no
      longer work and will need to be recreated
  * sbuild-qemu-update:
    - Fix QEMU launch issues (network, serial)
    - Reduce memory requirement. 1GiB is sufficient for apt-get operations
  * sbuild-qe...