MPI fixes (macOS build/link flags), oneAPI ifort->ifx switch; turn off MSMPI CI

[perazz]

• Fix Latest Xcode update has broken MPI builds on macOS #975
• Add %MSMPI_BIN% with Git-Bash style in CI
• CI: replace ifort with ifx in oneAPI runner. Fpm build now fails due to this issue
• Fix Intel fpm build by using -check all,nouninit (see above)
• Fix missing ifx,icx,icpx compilers from the current Intel MPI wrappers (Use of ifx in intel toolchains easybuilders/easybuild-framework#4056)

@fortran-lang/admins

[perazz]

It seems like something is now failing in the oneAPI CI (classic intel compilers deprecated?). I see that no fpm actions have been run for the past few months, so that might be the case. I will do some more tests

[henilp105]

Thanks @perazz , Looks Good to me.

[gnikit]

Looks good, there are quite a few changes though. I left some comments inline mostly with clean-up, underlying code seems good.

To make review faster, when possible, could we try and stick with 1 fix/feature per PR. One of the reasons why I delayed reviewing this is because fixes kept being added in this PR.

[perazz]

One of the reasons why I delayed reviewing this is because fixes kept being added in this PR.

I agree, committed to it. Unfortunately new issues kept arising in the CI as I was fixing the macOS flags

[gnikit]

LGTM 🚀

[perazz]

Thank you @gnikit @henilp105 @ivan-pi for the reviews, let's merge in a few days if there are no more comments.

[gnikit]

I will have a look in the windows metapackages CI to see if we can get it to work more reliably. If the Action is not robust yet, it might be worth disabling whilst troubleshooting to merge in main.

[perazz]

There are two approvals, so I will merge this one.