This should fix the issues found in SR

- Recreate old library scheme for existing products:
  It turned out the new scheme on existing systems has
  been causing package breakages.
- Do not generate baselibs.conf for HPC builds.
- Add support for gcc11 & 12.
- For SLE/Leap on x86_64 and s390x do not mix compiler versions
  as this will make the gfortran ABI version inconsistent. Instead
  use the stock compiler and set the list of kernels for x86_64
  cores explicitly as Cooperlake requires compiler intrinsics
  which are not provided by gcc 7.
- Require at least 7G of disk space for building.

- Make sure pre-existing (arch-independent) update-alternatives
  are wiped before registering new ones.
  Since update-alternatives has no reliable way to check if
  a certain 'generic name' exists, brute-force it and ignore
  any error (boo#1208248).
- Remove totally pointless - ie. never executed - %%posttrans
  script.
- Restore generic link for update-alternatives. This is usually
  set by the update-alternatives and it is '%ghost'ed but rpmlint
  complains.
- Add rpmlintrc rules to avoid false positives from consistently
  guessing the update-alternatives generic name wrong.
- Make arch dependent generic names conditional.

- Do not set LIBNAMESUFFIX to mark different flavors as this causes
  the SONAME to be different so that different flavors of OpenBLAS
  cannot serve as plugin replacements of each other (boo#1177260).
- Fix a fallout of making alternatives directory arch dependent.

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