Use patched GCC for glibc/GCC fixincludes issue

[msimberg]

Using spack/spack-packages#2596.

[msimberg]

cscs-ci run alps;system=beverin;uarch=mi200;uenv=prgenv-gnu:25.7

[msimberg]

This works*, but might be good to wait for spack/spack-packages#2596 to be merged before deploying this.

*works means that there is no "fixed" pthread.h include generated, and compilation using images built on the sles15sp5 and sles15sp6 images on beverin can be used to compile successfully on the other image.

[msimberg]

cscs-ci run alps;system=beverin;uarch=mi200;uenv=prgenv-gnu:25.7

[msimberg]

cscs-ci run alps;system=beverin;uarch=mi200;uenv=prgenv-gnu:25.7

[msimberg]

cscs-ci run alps;system=beverin;uarch=mi200;uenv=prgenv-gnu:25.7

[msimberg]

cscs-ci run alps;system=beverin;uarch=mi200;uenv=prgenv-gnu:25.7

[msimberg]

cscs-ci run alps;system=beverin;uarch=mi200;uenv=prgenv-gnu:25.7

[msimberg]

cscs-ci run alps;system=beverin;uarch=mi200;uenv=prgenv-gnu:25.7

[msimberg]

I will go ahead and deploy this as v11 on beverin.

Note that the newly added UenvFixincludes test passes with this uenv (https://gitlab.com/cscs-ci/ci-testing/webhook-ci/mirrors/551234120955960/1440398897047560/-/jobs/12483392591#L441, test added in eth-cscs/cscs-reframe-tests#474).

Because I had to bump the spack-packages commit, I needed to:

• constrain boost to 1.88.0 (same version as in v10, comment added issue and conflict submitted upstream)
• disable the newly added xccl variant on osu-micro-benchmarks which assumes that rccl is found from the base install of hip/rocm (I think this is the case from rocm 7 onwards, but not yet with 6.3.3; the new rocm 7 uenv should leave the xccl variant enabled if possible)

[msimberg]

I've deployed v11 on beverin:

$ uenv image find prgenv-gnu
uenv                        arch    system   id                size(MB)  date
prgenv-gnu/25.06-6.3.3:v11  amdgpu  beverin  9859e8eb31e99c8f   5,290    2025-12-19
prgenv-gnu/25.07-6.3.3:v10  amdgpu  beverin  50b03b9488654294   5,112    2025-11-20
prgenv-gnu/25.07-6.3.3:v8   amdgpu  beverin  c13f2d17e35f9631   8,855    2025-11-10
prgenv-gnu/25.07-6.3.3:v9   amdgpu  beverin  0046cd51ecd544e6   5,073    2025-11-12
prgenv-gnu/25.4:v1          mi300   beverin  ebdaf87acadc8c6d   6,345    2025-07-01
prgenv-gnu/25.4:v2          amdgpu  beverin  7d9ffe187c872376   6,592    2025-11-21

Compilation works on both the old and the new system image.