Intel compilers: Xeon Phi support deprecated

[zzzoom]

Intel has dropped support for Xeon Phi processors in their compilers from 2021.3 onward.

https://www.intel.com/content/www/us/en/developer/articles/release-notes/oneapi-fortran-compiler-release-notes-2021.html#inpage-nav-10 https://www.intel.com/content/www/us/en/developer/articles/release-notes/intel-oneapi-dpc-c-compiler-release-notes-2021.html#inpage-nav-6 https://www.intel.com/content/www/us/en/developer/articles/release-notes/oneapi-c-compiler-release-notes.html

[alalazo]

@rscohn2 If you have some time, could you please have a look at this and check if it looks good to you?

[alalazo]

Thanks @zzzoom !