[CI] Compile Uno with SPRAL

[amontoison]

It will help to add SPRAL / SSIDS in unopy.

Update:

• We need to recompile Hwloc with -fPIC on Linux if we want to use a static library...
• We need to add an option -DSPRAL_INCLUDE_DIR, it was working without it thanks to -DMUMPS_INCLUDE_DIR and -DMETIS_INCLUDE_DIR. We use the same folder for all headers with our UnoUtils.
• We have the following warning when we compile the interface of MUMPS:

 [06:07:19] /workspace/srcdir/Uno/uno/ingredients/subproblem_solvers/MUMPS/MUMPSSolver.cpp:134:30: warning: implicit conversion changes signedness: 'const int' to 'size_t' (aka 'unsigned long') [-Wsign-conversion]
[06:07:19]   134 |       return this->workspace.n - this->number_zero_eigenvalues();
[06:07:19]       |              ~~~~~~~~~~~~~~~~^ ~
[06:07:20] 1 warning generated.
``

[cvanaret]

@amontoison was SPRAL compiled with OpenMP in UnoUtils?

[amontoison]

Yes, LLVM OpenMP on Mac et GNUOpenMP and Windows / Linux.
You need -lomp or -lgomp.
I think you automatically add OpenMP in the dependency, but it is maybe only for MUMPS.

[cvanaret]

We're making progress!

TODO:

• some builds: undefined reference to METIS and OMP
• the unopy example fails with unopy.cpython-312-x86_64-linux-gnu.so: undefined symbol: hwloc_topology_set_type_filter and so on
• the wheel builds fail with undefined symbol: hwloc_topology_set_type_filter and so on
• the macOS wheel builds fail because libhwloc.a cannot be found
• the repair for macOS wheel builds fails (cannot find libhwloc.15.a)