OpenMP exceptions for AOCC

[DJDavies2]

Description

Comment out some OpenMP statements when AOCC defined. Needed to get ctests to pass with AOCC compiler.

I am not very happy about this, I wish I understood what the problem actually was.

Resolves #233

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[Ozaq]

Hello @DJDavies2 thanks for your contribution, however before accepting this PR, I think it is required to understand the underlying issue.

Please provide additional information as requested by @wdeconinck in #233. Preferably the AOCC version and cmake settings used to compile so that we can attempt to recreate the issue. Additionally the full cmake / ctest output could be helpful to diagnose the issue.

[wdeconinck]

As mentioned in issue #233, this is likely not a problem with the aocc compiler. I would not merge this, but rather turn off the OMP feature.
Within a bundle where you may have other projects with the OMP feature, you could be selective for eckit only using the ECKIT_ prefix, as in -DECKIT_ENABLE_OMP=OFF

[DJDavies2]

I will switch off OpenMP for eckit for now, thanks.