Improve cmake's FindMKL to avoid runtime issues and preloading libraries

[gbarter]

Feature or improvement description
This was a fix that we identified in WEIS projects running on Eagle a long time ago but of course forgot to submit a PR until we overwrote the fix with more recent OpenFAST versions.

When running on Eagle linux machines with the Intel compiler suite, we encounter an error that is well captured in various forums (here, here, here).

The suggested fix is to link to the mkl_rt library first or to preload the libraries in an environment variable using hard paths. The first approach is much more appealing and I can confirm that this has resolved our issues on Eagle using WEIS.

Related issue, if one exists
Not that I know

Impacted areas of the software
Regression tests run with intel compilers

Additional supporting information
Let me know if I can augment the description.

Test results, if applicable

I think this will be easier to do using the Github Actions workflow via this PR.

[rafmudaf]

@andrew-platt do you know how this might affect CMake with Intel for Windows? In that case, is there a runtime library?
It's the AND MKL_RT_LIB of if (MKL_IFACE_LIB AND MKL_SEQ_LIB AND MKL_CORE_LIB AND MKL_RT_LIB) that I'm looking at.

[andrew-platt]

@rafmudaf this worked ok with a CMake + OneAPI + VS just now. I started to wonder as well, so I tested it.

cmake .. -G "Visual Studio 16 2019"

[rafmudaf]

Thanks for checking @andrew-platt