Configuration: new server for tarballs and portability fixed

SUMMARY: no change is necessary for your pipeline after upgrading to this
commit.

Until this commit, the following noteworthy portability problems existed
that have been fixed as described in each item.

  - In commit 8908587 (titled "IMPORTANT: 73 software upgrades and added
    offline mode"; committed on 2025-02-11); the versions of all (except
    those that were not updated upstream) basic software as well as the
    high-level software necessary for Gnuastro were updated. This included
    Python. However, the update of Python could cause crashes in the
    Python-related software that are also in Maneage but not tested for
    that commit.
    -- With this commit, Python has been revered back to 3.10.6 (from
       3.13.2) and it has been taken to a dedicated part of 'versions.conf'
       (reminding the reader that the version of Python should only be
       updated by the Python maintainer: to ensure it doesn't conflict with
       Python-based builds).

  - Following the update of XZ Utils in 8908587, the custom build recipe
    that was necessary is no longer necessary. This was reported by Boud
    Roukema (see https://savannah.nongnu.org/bugs/index.php?62700).
    -- With this commit, XZ Utils uses our basic high-level build scripts.

  - CMake could use out-of-Maneage libraries for those that we already had
    in Maneage on some systems. This was reported by Boud Roukema (see
    https://savannah.nongnu.org/bugs/?63043)
    -- With this commit, CMake is built with '--no-system-libs'; so it
       builds and statically links to all its necessary libraries
       internally (not confusing between Maneage and the host).

  - Building Binutils 2.39 was likely to fail on older GCC versions due to
    special features (such as the 'gprofng' feature when building with GCC
    6.2.0). This was reported by Boud Roukema in
    https://savannah.nongnu.org/bugs/index.php?63242.
    -- With this commit, the 'gprofng' feature of Binutils has been
       disabled by default to allow reproducibility on older systems. If
       you need it, remove the '--enable-gprofng=no' option in the build
       recipe of Binutils.

  - The Maneage tarball repository is now also kept in 'gitlab.cefca.es'.
    -- With this commit, a new server URL has been added for this.

  - The list of TeXLive packages included some packages that get installed
    in the basic scheme that we do for the initial setup of TeXLive.
    -- With this commit, the extra packages have been removed.

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