Fix Lintian info file-references-package-build-path in Doxygen docs

Forwarded: not-needed
Last-Update: 2025-02-22

This patch updates docs/Doxyfile to set FULL_PATH_NAMES to NO. By doing so, it
prevents absolute build paths from being embedded in the generated document.
This patch fixes the following Lintian info message:
I: libgpiod-doc: file-references-package-build-path
Last-Update: 2025-02-22
Gbp-Pq: Name docs-disable-full-path-names

libgpiod (2.2.4-1) unstable; urgency=medium

  * New upstream release.
  * d/control:
    - bump Standards-Version to 4.7.4.
    - bump debhelper compat to 14.
  * d/watch:
    - enable upstream OpenPGP signature verification.
    - verify signatures over uncompressed tarballs.
  * d/upstream/signing-key.asc: add upstream OpenPGP signing key.
  * d/source/lintian-overrides: compressed orig tarball signature mismatch.

[dgit import unpatched libgpiod 2.2.4-1]

Import libgpiod_2.2.4.orig.tar.xz

[dgit import orig libgpiod_2.2.4.orig.tar.xz]

Import libgpiod_2.2.4-1.debian.tar.xz

[dgit import tarball libgpiod 2.2.4-1 libgpiod_2.2.4-1.debian.tar.xz]