Make an additional variant where intel-fortran-rt is compiled against intel-openmp for windows

[Krande]

Comment:

Hey,

we have a project that currently depends on intel-fortran-rt and mkl for windows. That means we're pulling packages with conflicting runtime requirements; intel-openmp (by mkl) and llvm-openmp (by intel-fortran-rt) which will clobber the libiomp5md.dll

If you think this might be worthwhile, I can make a PR that adds a variant of intel-fortran-rt that will be compiled using intel-openmp as a runtime requirement.

Let me know what you think,

Best Regards
Kristoffer