mesa update broke GL on nvidia nv34

Hi,
One of my machines is a powerbook 12" with nvidia nv34 chipset. Last
week there was an update to mesa packages and since then opengl has
stopped working. glxinfo reports "Error: couldn't find RGB GLX visual
or fbconfig", other GL applications have similar issues.

I believe the breaking upgrade was this one from 2024-10-17:
Upgrade: libglx-mesa0:powerpc (24.1.6-1, 24.2.4-1), libgbm1:powerpc
(24.1.6-1, 24.2.4-1), mesa-va-drivers:powerpc (24.1.6-1, 24.2.4-1),
libgl1-mesa-dri:powerpc (24.1.6-1, 24.2.4-1),
mesa-vulkan-drivers:powerpc (24.1.6-1, 24.2.4-1),
libglapi-mesa:powerpc (24.1.6-1, 24.2.4-1), libegl-mesa0:powerpc
(24.1.6-1, 24.2.4-1), mesa-vdpau-drivers:powerpc (24.1.6-1, 24.2.4-1)

I suspect I know the answer to this, but I'm going to ask just in
case: Are old .deb packages kept around online anywhere, or will I
need to rebuild the old versions to test which one broke the install
so I can report upstream? I've checked my apt cache and I don't have
the original packages, presumably because they were installed during
my initial installation.

Thanks,
Ed