Bug#1132617: mesa: update debian trixie-backports to 26.0.x

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Hi everyone,

I've been following the discussion regarding the Mesa 26 transition for
trixie-backports. While the team evaluates the blockers for the major 26.0
upgrade, I would like to provide a tested, ready-to-use intermediate update.

I have successfully built and tested *Mesa 25.2.8-2* in a clean Debian
Trixie (amd64) environment. This allows the archive to move from 25.2.6 to
the latest stable point release of the 25.2 branch without requiring major
updates to the base system.

My changes involve two minimal adjustments in debian/control.in to ensure
compatibility with Trixie's current packages:

   1.

   Lowered libdrm-dev and runtime dependencies to >= 2.4.124-1.
   2.

   Adapted spirv-tools-dev to spirv-tools (>= 2025.1~rc1-1) due to the
   package renaming in the current archive.

Attached is the debdiff for *mesa_25.2.8-2~bpo13+1*. It installs cleanly
and runs perfectly (tested with llvmpipe). I hope this helps as a reliable
fallback while the transition to Mesa 26 is finalized.

Best regards,

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<div dir=3D"ltr"><p>Hi everyone,</p><p>I&#39;ve been following the discussi=
on regarding the Mesa 26 transition for <code>trixie-backports</code>. Whil=
e the team evaluates the blockers for the major 26.0 upgrade, I would like =
to provide a tested, ready-to-use intermediate update.</p><p>I have success=
fully built and tested <b>Mesa 25.2.8-2</b> in a clean Debian Trixie (amd64=
) environment. This allows the archive to move from 25.2.6 to the latest st=
able point release of the 25.2 branch without requiring major updates to th=
e base system.</p><p>My changes involve two minimal adjustments in <code>de=
bian/<a href=3D"http://control.in">control.in</a></code> to ensure compatib=
ility with Trixie&#39;s current packages:</p><ol start=3D"1"><li><p>Lowered=
 <code>libdrm-dev</code> and runtime dependencies to &gt;=3D 2.4.124-1.</p>=
</li><li><p>Adapted <code>spirv-tools-dev</code> to <code>spirv-tools (&gt;=
=3D 2025.1~rc1-1)</code> due to the package renaming in the current archive=
.</p></li></ol><p>Attached is the <code>debdiff</code> for=C2=A0<code><b>me=
sa_25.2.8-2~bpo13+1</b></code>. It installs cleanly and runs perfectly (tes=
ted with <code>llvmpipe</code>). I hope this helps as a reliable fallback w=
hile the transition to Mesa 26 is finalized.</p><p>Best regards,</p><br></d=
iv>

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