Add Intel OneAPI Fortran compiler support to mpif90.mk include file

[Wolfgang Hayek (tinyendian)]

PR Summary

Sci/Tech Reviewer:
Code Reviewer: Cameron Bateman (@cameronbateman-mo)

This PR adds the Intel OneAPI Fortran compiler ifx to the list of known compilers in the mpif90.mk include file used by the LFRic build system, closing #354. The addition of ifx is a prerequisite for MetOffice/lfric_apps#468 / MetOffice/lfric_apps#477.

While I originally planned to add ifx to the mpifort.mk and icpx to mpic++.mk include files, it turned out that Intel OneAPI MPI does not support the corresponding wrappers, so I cannot test these changes.

There is currently no ESNZ site configuration available for lfric_core to test the change, but I successfully ran LFRic Apps Rose Stem tests using this branch in MetOffice/lfric_apps#477.

Code Quality Checklist

• I have performed a self-review of my own code
• My code follows the project's style guidelines
• Comments have been included that aid understanding and enhance the readability of the code
• My changes generate no new warnings
• All automated checks in the CI pipeline have completed successfully

Testing

• I have tested this change locally, using the LFRic Core rose-stem suite
• If required (e.g. API changes) I have also run the LFRic Apps test suite using this branch
• If any tests fail (rose-stem or CI) the reason is understood and acceptable (e.g. kgo changes)
• I have added tests to cover new functionality as appropriate (e.g. system tests, unit tests, etc.)
• Any new tests have been assigned an appropriate amount of compute resource and have been allocated to an appropriate testing group (i.e. the developer tests are for jobs which use a small amount of compute resource and complete in a matter of minutes)

trac.log

Not available - ESNZ site configuration currently not available for Rose Stem.

Security Considerations

• I have reviewed my changes for potential security issues
• Sensitive data is properly handled (if applicable)
• Authentication and authorisation are properly implemented (if applicable)

Performance Impact

• Performance of the code has been considered and, if applicable, suitable performance measurements have been conducted

AI Assistance and Attribution

• Some of the content of this change has been produced with the assistance of Generative AI tool name (e.g., Met Office Github Copilot Enterprise, Github Copilot Personal, ChatGPT GPT-4, etc) and I have followed the Simulation Systems AI policy (including attribution labels)

Documentation

• Where appropriate I have updated documentation related to this change and confirmed that it builds correctly

PSyclone Approval

• If you have edited any PSyclone-related code (e.g. PSyKAl-lite, Kernel interface, optimisation scripts, LFRic data structure code) then please contact the TCD Team

Sci/Tech Review

• I understand this area of code and the changes being added
• The proposed changes correspond to the pull request description
• Documentation is sufficient (do documentation papers need updating)
• Sufficient testing has been completed

(Please alert the code reviewer via a tag when you have approved the SR)

Code Review

• All dependencies have been resolved
• Related Issues have been properly linked and addressed
• CLA compliance has been confirmed
• Code quality standards have been met
• Tests are adequate and have passed
• Documentation is complete and accurate
• Security considerations have been addressed
• Performance impact is acceptable

[Wolfgang Hayek (tinyendian)]

Should be good to go - reassigning to Matthew Hambley (@MatthewHambley) for review