Final updates required for building unified environment on HPC, cloud, macOS

[climbfuji]

Description

A number of unrelated updates and bug fixes required for building the unified environment on HPC, cloud, macOS. All these were tested on the different platforms.

1. Make ncl a variant in global-workflow-env (by default on), and make it conflict with macOS
2. Bug fix in bufr for long lines in auto-generated code. Note that a similar change was merged into the NCEPLIBS-bufr repository on Feb 15 (Reduce line length for MASTERTABLE replacements NOAA-EMC/NCEPLIBS-bufr#321), which means the workaround here is only needed for versions up to 11.7.1
3. Bug fix in libelf: also need to run autoreconf on macOS Intel when using Rosetta 2, not just on native M1
4. Cherry-pick 548aa21 from authoritative spack repository (Bug fix for duplicate rpath errors on macOS when creating build caches spack/spack#34375) - in preparation for using build caches

This PR has been tested extensively with JCSDA/spack-stack#454

[JessicaMeixner-NOAA]

@climbfuji not sure why I'm requested as a reviewer here. I'm on leave until Tuesday so if you need a review sooner, we'll need to reach out to someone else.

[climbfuji]

@climbfuji not sure why I'm requested as a reviewer here. I'm on leave until Tuesday so if you need a review sooner, we'll need to reach out to someone else.

Ah no worries, I wanted you to be aware and provide you with the opportunity to tick some of the testing boxes in case you were successful. If enough people test and review beforehand we'll merge it, otherwise it's going to be next week.

[AlexanderRichert-NOAA]

As long as you've tested the relocate-related changes to your satisfaction, then this looks good.

[climbfuji]

As long as you've tested the relocate-related changes to your satisfaction, then this looks good.

Yes, I've tested them and also the spack developers tested them when we merged those changes upstream a few weeks ago. I am going to see what the CI tests are doing in the spack-stack PR, and also run the build on my mac os with the self-hosted runner later tonight before merging anything.