- Add build support for gcc10 to HPC build (bsc#1174439).
- Add openmpi4 flavors.
- Revert: Use memoryperjob constraint instead of %limit_build macro.
This would attempt to find a work whose memory matches the number
of jobs available * memoryperjob. Such workers may not exist.
- Use 'module load netcdf' - this is now the load command for
all variants of netcdf. (forwarded request 833999 from eeich)